WooCommerce Smart Coupons 8.22.0

* Fix: Selected coupon design for email is not getting sent in the order received email
* Fix: Width of checkbox in 'Bulk generate form'
* Fix: Incorrectly selecting the colors setting for a coupon if the background & foreground color is already set
* Fix: Coupons in the email are not center-aligned
* Fix: Sometimes colors selected for coupons are not applying to coupons in the email
* Fix: Empty description in some coupons on the frontend
* Update: POT file

* Fix: Discount not applied on taxes when Apply before tax is disabled [WooCommerce AvaTax]
* Update: Remove usage of deprecated jQuery event 'ready' & function 'load' [WordPress 5.5]
* Update: POT file

* New: Group coupons by category
* New: Tested upto WooCommerce 4.4.1 & WordPress 5.5
* Fix: 'Click to Copy' updating coupon
* Fix: Max discount not working
* Update: Link color in footer
* Update: Code improvements for admin CSS
* Developer: Hook 'wc_sc_before_shortcode_smart_coupons_html_start'
* Developer: Hook 'wc_sc_coupon_code_allowed_characters'
* Developer: Hook 'wc_sc_is_coupon_restriction_available'
* Update: POT file