YITH WooCommerce Membership Premium 2.20.0

* New: support for WooCommerce 8.2
* Update: YITH plugin framework
* Dev: new filter 'yith_wcmbs_is_allowed_download'

* New: support for WooCommerce 8.1
* New: integration for YITH Dynamic Pricing & Discount 4.0
* Update: YITH plugin framework
* Fix: select placeholder visibility style issue
* Dev: new filter 'yith_wcmbs_get_downloads_by_product_id'

* New: hide price and add to cart buttons for members in new WooCommerce blockified templates
* Update: YITH plugin framework
* Update: language files
* Fix: membership protected content Gutenberg block
* Fix: avoid the use of wpautop when not needed
* Fix: showing global alternative content