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/phpcs-ruleset.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0"?>
+<ruleset name="Custom Standard">
+  <description>PSR2 without line ending rule - let git manage the EOL cross the platforms</description>
+  <rule ref="PSR2" />
+  <rule ref="Generic.Files.LineEndings">
+      <exclude name="Generic.Files.LineEndings.InvalidEOLChar"/>
+  </rule>
+</ruleset>