WooCommerce Groups 2.12.0

* WordPress 5.5 compatible.
* WooCommerce 4.4 compatible.
* Fixed an incorrect variable reference when rendering subscription information for variable subscriptions.
* Added the groups_woocommerce_user_show_subscriptions_options filter.
* Showing all columns for group subscriptions in user profile instead of limited set.
* Fixed minor missing variable initializations (did not cause functional impact).
* Fixed missing translations.
* Updated translations.

* WordPress 5.3 compatible.
* WooCommerce 4.0 compatible.
* Enhanced the products screen column showing groups related to products, now sortable.

* Updated for compatibility with changes in WooCommerce Subscriptions 2.6.
* Added a woocommerce_subscriptions_switch_completed handler.
* Added related extensions info.