YITH WooCommerce Wishlist Premium 4.0.1

* New: support for WooCommerce 4.6
* Update: plugin framework
* Tweak: return product price as float in item class
* Fix: bulk add to cart checkbox in the wishlist table not working
* Fix: prevent possible fatal error when printing ATW button
* Fix: original price being sent to database as int instead of float
* Fix: wrong layout being loaded for manage endpoint
* Dev: added new filter yith_wcwl_get_product_image_with_path
* Dev: added new filter yith_wcwl_set_session_cookie
* Dev: added new filter yith_wcwl_privacy_value
* Dev: added new filter yith_wcwl_wishlist_privacy_types
* Dev: added new filter yith_wcwl_available_admin_tabs_premium
* Dev: added new parameter to yith_wcwl_{privacy}_wishlist_visibility filter

* Fix: moved check over Ajax Loading option on first wishlist init only, to avoid problems when dynamically loading ATW on variable products

* New: support for WooCommerce 4.2
* Update: plugin framework
* Tweak: set minimum item quantity to 1
* Tweak: added WordPress among blocked bot user agents
* Tweak: make sure to finalize session when possible
* Tweak: added link to product in wishlist mobile template
* Fix: Prevent error if default wishlist doesn't exists
* Fix: update button not saving items position
* Fix: correctly applied yith_wcwl_is_wishlist_responsive filter to yith_wcwl_is_mobile function
* Fix: wrong check over show_ask_an_estimate_button
* Fix: avoid to use cache that cannot be invalidated (stop caching queries results, use cache for user wishlists)
* Fix: Ask an Estimate button on mobile footer not using dedicated label option
* Fix: additional info popup not appearing for guest users
* Fix: clear_caches method wasnt properly cleaning cache for guest users
* Dev: added yith_wcwl_ask_for_an_estimate_popup_text filter
* Dev: added yith_wcwl_show_wishlist_update_button filter
* Dev: added yith_wcwl_add_to_wishlist_icon_html filter
* Dev: added yith_wcwl_add_to_wishlist_heading_icon_html filter
* Dev: added yith_wcwl_add_to_wishlist_data trigger, to allow third party code change data submitted with ATW ajax call