WooCommerce URL Coupons 2.16.2

* Misc - Improve escaping and sanitizing throughout codebase
* Misc - Tested up to WooCommerce 10.2

* Fix - "Translations loaded too early" error
* Fix - Undefined index error when creating coupons via the REST API
* Misc - Update the SkyVerge Framework to v5.15.11

* Feature - Add support for the cart and checkout blocks

* Misc - Require PHP 7.4 and WordPress 5.6