WooCommerce Smart Coupons 8.22.0

* Update: Remove Order Personal data on WooCommerce hook
* Update: Query to handle lengthy data
* Update: Remove debug code
* Update: Text domain
* Update: POT file

* New: [GDPR] Privacy Policy Content
* New: [GDPR] Personal Data Export (WordPress 4.9.6+)
* New: [GDPR] Personal Data Erase (WordPress 4.9.6+)
* Update: Hook to decide whether to auto-generate a coupon or not
* Update: Hook to decide whether to show coupon as valid or invalid
* Update: Import-Export of coupon usage data
* Update: Minor CSS (Admin Send Store Credit tab)
* Update: POT file

* Fix: Import failing for CSV file which is exported from the plugin itself
* Fix: Serialized meta data is not copied correctly during Bulk Generate of coupons
* Update: Hook for adding meta during auto-generation of new coupon
* Update: POT File