*Fixed the checked field error disabaling the product info editor.

* Fix-Fixed error that prevented category-specific Global Subscription Plans from applying to variations.

* Tweak-Check the minimum requirements before initializing the extension.
* Tweak-Added missing descriptions to the translatable strings.
* Tweak-Tested compatibility up to WC 6.9.
* Fix-Fixed a typo in the widget texts.
* Dev-Updated the minimum requirements to WC 3.5, WP 4.7, and PHP 5.4.

* WordPress 6.0 compatible.
* WooCommerce 6.9 compatible.
* Added a feature to the Products admin section, which allows to filter the Products by group membership added or removed.
* Updated the translation template.
* Updated the German formal and informal translations for Germany, Switzerland, Austria.
* Updated the Spanish translation.
* Updated the French translation.