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/exec-with-fallback/phpstan.neon

@@ -0,0 +1,3 @@
+parameters:
+    ignoreErrors:
+        - '#PHPDoc tag @param.*Unexpected token "&"#'