WooCommerce Smart Coupons 9.18.0

* New: Tested up to WooCommerce 4.9.2
* Update: Improvements related to sanitizing & escaping data
* Update: POT file

* New: Tested up to WooCommerce 4.9.0
* Fix: Error 'Invalid payment method' when fully paid via store credit [WPML]
* Fix: When the 'Max discount' is set, sometimes the discount calculated is not accurate
* Update: POT file

* Fix: 'Exclude attributes' restriction overriding 'Exclude categories' restriction
* Fix: 'Max discount' is not getting calculated properly in case of WooCommerce setting for a decimal value other than 2
* Fix: Setting 'Disable email restriction' not working in case of coupons scheduled to be sent at a later date
* Fix: Purchased coupons that are scheduled to be sent later via email, are not getting emailed in some cases
* Fix: Removed unnecessary 'console.log'
* Fix: HTML & CSS of add & remove button of 'Taxonomy' restrictions for responsiveness
* Update: Display details of scheduled coupons in order under 'Generated coupons' meta box
* Update: POT file