WooCommerce Smart Coupons 9.18.0

* New: Tested up to WooCommerce 5.4.1
* Fix: 1-click coupon apply not working with CheckoutWC
* Fix: WordPress database error Table doesn't exist when referring to users table in a multisite environment [Thanks to: Bradley Cross]
* Update: During manual creation of order from admin side, allow application of coupon that is restricted for user roles
* Update: POT file

* Fix: CRITICAL Uncaught Exception: This coupon is valid for the first order only
* Fix: Incorrect calculation when multiple store credit is applied
* Fix: 'Coupon shareable link' not working, added param 'sc-page' in the shareable link
* Update: Hook 'wc_sc_is_filter_content_coupon_message' to decide whether to filter the content of the coupon message or not, before displaying on the website
* Update: Default arguments for method WC_SC_Coupon_Message::wc_add_coupons_message_in_email [PHP8]
* Update: POT file

* New: Tested up to WooCommerce 5.3.0 & WordPress 5.7.2
* Fix: PHP Warning: The magic method WC_Smart_Coupons::__wakeup() must have public visibility [PHP8]
* Fix: Named parameters in call_user_func_array [PHP8] [Thanks to: Noah]
* Update: Documentation link for coupon search limitations for the setting 'Enable store notice for the coupon'
* Update: POT file