WooCommerce Smart Coupons 8.22.0

* New: Allow linking of coupon to variations as well
* Developer: Hook 'wc_sc_is_filter_content_coupon_message'
* Update: Highlight Smart Coupons' field under product
* Update: Coupon design templates for handling empty coupon amount
* Update: API namespace
* Update: POT file

* New: Tested upto WooCommerce 4.6.0
* New: API support for generating coupons
* Fix: Incorrectly overriding 'custom-design' for coupon on saving the settings
* Fix: Incorrectly adding 'is_email' attribute when adding shortcode using WP editor button
* Fix: Reduce multiple AJAX request on the cart & the checkout page to one (happens only in some cases) (Thanks to: BuildWooFunnels)
* Fix: Links added in the message, which will be sent along with the coupon, those links are broken in the received email
* Update: Display store notice for coupon based on the coupon's status
* Update: Provide support for selecting order statuses to consider during the validation of new user coupons
* Developer: Hook 'wc_sc_should_coupon_auto_generate'
* Update: POT file

* New: Set a coupon to display as storewide offer coupon. It will be displayed everywhere on the website.
* Fix: Initialization of Action Scheduler package
* Update: Action Scheduler package to version 3.1.6
* Update: Delayed execution of function 'handle_coupon_process_on_3rd_party_order_statuses' to support necessary changes to take place
* Update: POT file