diff --git a/composer.json b/composer.json
index 3043f8fb..7f8ac0be 100644
--- a/composer.json
+++ b/composer.json
@@ -53,19 +53,19 @@
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-        "markbaker/matrix": "^1.1"
+        "markbaker/matrix": "^1.2",
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-        "dompdf/dompdf": "^0.8.0",
-        "mpdf/mpdf": "^7.0.0",
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+        "friendsofphp/php-cs-fixer": "^2.16",
         "jpgraph/jpgraph": "^4.0",
-        "friendsofphp/php-cs-fixer": "@stable",
-        "phpcompatibility/php-compatibility": "^8.0",
-        "squizlabs/php_codesniffer": "^3.3",
-        "phpunit/phpunit": "^7.5"
+        "mpdf/mpdf": "^8.0",
+        "phpcompatibility/php-compatibility": "^9.3",
+        "phpunit/phpunit": "^7.5",
+        "squizlabs/php_codesniffer": "^3.5",
+        "tecnickcom/tcpdf": "^6.3"
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diff --git a/composer.lock b/composer.lock
index 6b1ba8ab..59850e2a 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
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-    "content-hash": "669a432d9ce5fef80535c0aae2e48b9b",
+    "content-hash": "0fd32acfbb0d21f168f495840ffc8d7e",
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@@ -103,30 +103,29 @@
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-            "version": "1.1.4",
+            "version": "1.2.0",
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                 "url": "https://github.com/MarkBaker/PHPMatrix.git",
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-                "sebastian/phpcpd": "2.*",
-                "squizlabs/php_codesniffer": "^3.3.0"
+                "dealerdirect/phpcodesniffer-composer-installer": "dev-master",
+                "phpcompatibility/php-compatibility": "dev-master",
+                "phploc/phploc": "^4",
+                "phpmd/phpmd": "dev-master",
+                "phpunit/phpunit": "^5.7",
+                "sebastian/phpcpd": "^3.0",
+                "squizlabs/php_codesniffer": "^3.0@dev"
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             "autoload": {
@@ -169,7 +168,7 @@
                 "matrix",
                 "vector"
             ],
-            "time": "2018-11-04T22:12:12+00:00"
+            "time": "2019-10-06T11:29:25+00:00"
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@@ -223,16 +222,16 @@
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+            "version": "1.5.0",
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-                "reference": "c7cb9a2095a074d131b65a8a0cd294479d785573",
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@@ -281,28 +280,28 @@
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-            "time": "2016-08-30T16:08:34+00:00"
+            "time": "2019-03-19T17:25:45+00:00"
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+            "version": "1.4.0",
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                 "url": "https://github.com/composer/xdebug-handler.git",
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-                "reference": "b8e9745fb9b06ea6664d8872c4505fb16df4611c",
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-                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5"
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || 6.5 - 8"
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@@ -320,39 +319,39 @@
                     "email": "john-stevenson@blueyonder.co.uk"
                 }
             ],
-            "description": "Restarts a process without xdebug.",
+            "description": "Restarts a process without Xdebug.",
             "keywords": [
                 "Xdebug",
                 "performance"
             ],
-            "time": "2018-08-31T19:07:57+00:00"
+            "time": "2019-11-06T16:40:04+00:00"
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         {
             "name": "doctrine/annotations",
-            "version": "v1.4.0",
+            "version": "v1.8.0",
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                 "url": "https://github.com/doctrine/annotations.git",
-                "reference": "54cacc9b81758b14e3ce750f205a393d52339e97"
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                 "doctrine/lexer": "1.*",
-                "php": "^5.6 || ^7.0"
+                "php": "^7.1"
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             "require-dev": {
                 "doctrine/cache": "1.*",
-                "phpunit/phpunit": "^5.7"
+                "phpunit/phpunit": "^7.5"
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+                    "dev-master": "1.7.x-dev"
                 }
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@@ -365,6 +364,10 @@
                 "MIT"
             ],
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+                {
+                    "name": "Guilherme Blanco",
+                    "email": "guilhermeblanco@gmail.com"
+                },
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                     "name": "Roman Borschel",
                     "email": "roman@code-factory.org"
@@ -373,10 +376,6 @@
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-                    "name": "Guilherme Blanco",
-                    "email": "guilhermeblanco@gmail.com"
-                },
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@@ -393,7 +392,7 @@
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-            "time": "2017-02-24T16:22:25+00:00"
+            "time": "2019-10-01T18:55:10+00:00"
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@@ -453,21 +452,24 @@
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-            "version": "v1.0.1",
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                 "url": "https://github.com/doctrine/lexer.git",
-                "reference": "83893c552fd2045dd78aef794c31e694c37c0b8c"
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+            },
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@@ -475,8 +477,8 @@
                 }
             },
             "autoload": {
-                "psr-0": {
-                    "Doctrine\\Common\\Lexer\\": "lib/"
+                "psr-4": {
+                    "Doctrine\\Common\\Lexer\\": "lib/Doctrine/Common/Lexer"
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             "notification-url": "https://packagist.org/downloads/",
@@ -497,40 +499,47 @@
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                 }
             ],
-            "description": "Base library for a lexer that can be used in Top-Down, Recursive Descent Parsers.",
-            "homepage": "http://www.doctrine-project.org",
+            "description": "PHP Doctrine Lexer parser library that can be used in Top-Down, Recursive Descent Parsers.",
+            "homepage": "https://www.doctrine-project.org/projects/lexer.html",
             "keywords": [
+                "annotations",
+                "docblock",
                 "lexer",
-                "parser"
+                "parser",
+                "php"
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-            "time": "2014-09-09T13:34:57+00:00"
+            "time": "2019-06-08T11:03:04+00:00"
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-            "version": "v0.8.2",
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                 "url": "https://github.com/dompdf/dompdf.git",
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-                "reference": "5113accd9ae5d466077cce5208dcf3fb871bf8f6",
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                 "phenx/php-svg-lib": "0.3.*",
                 "php": ">=5.4.0"
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             "require-dev": {
-                "phpunit/phpunit": "4.8.*",
+                "phpunit/phpunit": "^4.8|^5.5|^6.5",
                 "squizlabs/php_codesniffer": "2.*"
             },
+            "suggest": {
+                "ext-gd": "Needed to process images",
+                "ext-gmagick": "Improves image processing performance",
+                "ext-imagick": "Improves image processing performance"
+            },
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@@ -565,20 +574,20 @@
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-            "time": "2017-11-26T14:49:08+00:00"
+            "time": "2018-12-14T02:40:31+00:00"
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             "name": "friendsofphp/php-cs-fixer",
-            "version": "v2.13.1",
+            "version": "v2.16.0",
             "source": {
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                 "url": "https://github.com/FriendsOfPHP/PHP-CS-Fixer.git",
-                "reference": "54814c62d5beef3ba55297b9b3186ed8b8a1b161"
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-                "reference": "54814c62d5beef3ba55297b9b3186ed8b8a1b161",
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@@ -587,7 +596,7 @@
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                 "ext-json": "*",
                 "ext-tokenizer": "*",
-                "php": "^5.6 || >=7.0 <7.3",
+                "php": "^5.6 || ^7.0",
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@@ -599,21 +608,19 @@
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                 "justinrainbow/json-schema": "^5.0",
-                "keradus/cli-executor": "^1.1",
+                "keradus/cli-executor": "^1.2",
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-                "phpunitgoodpractices/traits": "^1.5.1",
-                "symfony/phpunit-bridge": "^4.0"
+                "php-cs-fixer/phpunit-constraint-isidenticalstring": "^1.1",
+                "php-cs-fixer/phpunit-constraint-xmlmatchesxsd": "^1.1",
+                "phpunit/phpunit": "^5.7.27 || ^6.5.14 || ^7.1",
+                "phpunitgoodpractices/traits": "^1.8",
+                "symfony/phpunit-bridge": "^4.3",
+                "symfony/yaml": "^3.0 || ^4.0"
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@@ -646,17 +653,17 @@
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-                    "email": "dariusz.ruminski@gmail.com"
-                },
                 {
                     "name": "Fabien Potencier",
                     "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Dariusz Rumiński",
+                    "email": "dariusz.ruminski@gmail.com"
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             "description": "A tool to automatically fix PHP code style",
-            "time": "2018-10-21T00:32:10+00:00"
+            "time": "2019-11-03T13:31:09+00:00"
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@@ -700,16 +707,16 @@
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-            "version": "v7.1.6",
+            "version": "v8.0.3",
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                 "url": "https://github.com/mpdf/mpdf.git",
-                "reference": "ef5d8cf2c63def40fb76fc0a9e286721cb4dffcd"
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@@ -717,14 +724,15 @@
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                 "paragonie/random_compat": "^1.4|^2.0|9.99.99",
-                "php": "^5.6 || ~7.0.0 || ~7.1.0 || ~7.2.0",
+                "php": "^5.6 || ~7.0.0 || ~7.1.0 || ~7.2.0 || ~7.3.0",
                 "psr/log": "^1.0",
-                "setasign/fpdi": "1.6.*"
+                "setasign/fpdi": "^2.1"
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+                "mpdf/qrcode": "^1.0.0",
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-                "squizlabs/php_codesniffer": "^2.7.0",
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@@ -757,27 +765,27 @@
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             ],
-            "description": "A PHP class to generate PDF files from HTML with Unicode/UTF-8 and CJK support",
+            "description": "PHP library generating PDF files from UTF-8 encoded HTML",
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                 "php",
                 "utf-8"
             ],
-            "time": "2018-10-18T11:37:12+00:00"
+            "time": "2019-10-25T17:54:07+00:00"
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-            "version": "1.9.1",
+            "version": "1.9.3",
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@@ -812,37 +820,33 @@
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-            "time": "2019-04-07T13:18:21+00:00"
+            "time": "2019-08-09T12:45:53+00:00"
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-            "version": "v2.0.17",
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+                "php": "^7"
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-                "phpunit/phpunit": "4.*|5.*"
+                "phpunit/phpunit": "4.*|5.*",
+                "vimeo/psalm": "^1"
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-                    "email": "sebastian@phpunit.de"
-                },
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                     "email": "aharvey@php.net"
+                },
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@@ -2071,7 +2128,7 @@
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@@ -2356,32 +2413,39 @@
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+                "setasign/fpdf": "FPDI will extend this class but as it is also possible to use TCPDF or tFPDF as an alternative. There's no fixed dependency configured.",
                 "setasign/fpdi-fpdf": "Use this package to automatically evaluate dependencies to FPDF.",
-                "setasign/fpdi-tcpdf": "Use this package to automatically evaluate dependencies to TCPDF."
+                "setasign/fpdi-tcpdf": "Use this package to automatically evaluate dependencies to TCPDF.",
+                "setasign/fpdi-tfpdf": "Use this package to automatically evaluate dependencies to tFPDF."
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+                "contracts",
+                "decoupling",
+                "interfaces",
+                "interoperability",
+                "standards"
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