YITH WooCommerce Bulk Product Editing Premium 3.5.0

* New: support for WordPress 5.6
* New: support for WooCommerce 4.8
* Update: plugin framework
* Update: language files
* Dev: deprecated yith_wcbep_get_slug_info filter
* Dev: added yith_wcbep_category_name filter

New: support for WooCommerce 4.7
Update: plugin framework
Update: language files
Fix: issue when bulk editing categories or custom taxonomies and there is any variation selected

* New: support for WooCommerce 4.5
* Update: plugin framework
* Update: language files
* Fix: issue when filtering products with 'No shipping class'
* Tweak: prevent 'non well formed numeric value' issue with date