YITH WooCommerce Wishlist Premium 3.31.0

Fix: possible warning when Add to Wishlist shortcode is called with no params
New: added support to WordPress 5.0
New: added support to WooCommerce 3.5.3
New: added Gutenberg blocks for plugin shortcodes
Update: internal plugin framework
Update: italian language
Fix: preventing sql error when hidden products list just contains 0 id
Fix: problem with sprintf on backend
Dev: added product param to yith_free_text filter
Dev: added yith_wcwl_login_register_redirect filter to let third party code filter redirect uri for unauthenticated users

* New: updated plugin framework

* New: added support to WooCoommerce 3.5
* New: added support to WordPress 4.9.8
* New: added method that returns localization variables
* New: updated plugin framework
* Tweak: type attribute from <script> tag
* Update: Spanish language
* Update: Italian language
* Dev: added new filter yith_wcwl_localize_script to let third party dev filter localization variables
* Dev: added new filter yith_wcwl_column_default
* Dev: added new filter yith_wcwl_wishlist_column
* Dev: added new filter yith_wcwl_share_conditions to display the share buttons for no logged users
* Dev: added new filter yith_wcwl_set_cookie to let third party code skip cookie saving
* Dev: added new filter yith_wcwl_wishlist_visibility_string_value to the wishlist visibility value
* Dev: added new filter yith_wcwl_manage_wishlist_title
* Dev: added new filter yith_wcwl_create_wishlist_title
* Dev: added new filter yith_wcwl_search_wishlist_title
* Dev: added new filter yith_wcwl_result_wishlist
* Dev: added new filter yith_wcwl_empty_search_result
* Dev: added new filter yith_wcwl_wishlist_param to change query-string param
* Dev: added new filter yith_wcwl_remove_product_wishlist_message_title