WooCommerce Free Gift Coupons 3.8.2

* Update: Tested up to WooCommerce 10.7.0.
* Update: Declare `product_instance_caching` feature compatibility.

* IMPORTANT: PHP 7.4 is required | WordPress 6.2.0 is required | WooCommerce 8.2.0.
* Fix: PHP Fatal error: Call to a member function get_cart() on null on `wc/store/order` Store API route. Pay-for-order conflict with WooPayments.
* Change: Remove static instance of WC_FGC_Checkout_Block_Integration.
* Change: Rename `wc-fgc-checkout-blocks` script handle to `wc-fgc-checkout-block` and integration name from and `free_gift_coupons/checkout` to `wc-fgc/checkout`
* Tweak: Add wp_theme_get_element_class_name( 'button' ) classes to cart edit button.

* Fix: Hardening of variation form script when form has no action attribute.
* Fix: Uncaught TypeError: c.offset() is undefined when in 3rd party carts.

* Important: Minimum PHP 7.2 required.
* Update: Tested up to WooCommerce 8.7.0.
* New: Eliminated dynamic properties on objects. Resolves warning notices in PHP 8.2+.
* Tweak - Updated the way of identifying hydration context in Store API requests.

* Update: Tested up to WooCommerce 8.4.0.
* New: Prelimary support for variable gifts in cart block. For now it will re-direct to the single product page.
* New: Declare cart/checkout block support.
* Fix: Much stricter add to cart validation on gift items, esp for variations with some attributes pre-configured but "Any" value allowed for other attributes.

* Fix: Misspelling of update_option()

* Fix: Prevent display of All Products for Subscriptions' radio subscription schemes on free gifts in cart. #115

* Update: Tested against WooCommerce 6.5.0.
* Fix: Fatal Error in update routine, call "Call to protected method WP_Background_Process::is_process_running()", reintroduced by code standards sniffing.

* Fix: Load RTL stylesheets when not in SCRIPT_DEBUG mode.
* New: Display notices to store managers in front-end and admin when a gift product is not purchasable.
* Update: Move cart/order "Free!" price filters to later priority for compat with discounting plugins.

* Update: Tested against WooCommerce 5.8.0.
* Fix: Do not count the cart quantity of the gift itself when syncing quantities of variation to parent variable.
* Fix: Restore price filters in the cart to display "Free!"