Add X13 WebP module for image conversion to next-generation formats

- Implemented the X13Webp class with core functionalities for converting images to WebP format.
- Added support for different PHP versions and defined constants for versioning.
- Included translation strings for various user interface elements and messages.
- Created XML file for module versioning.

modules/x13webp/vendor/rosell-dk/webp-convert/phpunit-41.xml.dist

@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/4.1/phpunit.xsd"
+         backupGlobals="false"
+         backupStaticAttributes="false"
+         colors="true"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true"
+         convertWarningsToExceptions="false"
+         processIsolation="false"
+         stopOnFailure="false"
+         bootstrap="vendor/autoload.php"
+
+>
+    <testsuites>
+        <testsuite name="WebPConvert Test Suite">
+            <directory>./tests/</directory>
+        </testsuite>
+    </testsuites>
+
+    <filter>
+        <whitelist>
+            <directory suffix=".php">src/</directory>
+            <exclude>
+                <directory>./vendor</directory>
+                <directory>./tests</directory>
+            </exclude>
+        </whitelist>
+    </filter>
+
+    <logging>
+        <log type="junit" target="build/report.junit.xml"/>
+        <log type="coverage-clover" target="coverage.clover"/>
+        <log type="coverage-text" target="build/coverage.txt"/>
+        <log type="coverage-html" target="build/coverage"/>
+    </logging>
+
+</phpunit>