WooCommerce Store Credit 4.5.6

* Feature - Display the receiver fields expanded on the Store Credit product page.
* Tweak - Optionally, remove the plugin options when uninstalling it.
* Tweak - Check the minimum requirements before initializing the plugin.

* Tweak - Added compatibility with WP 5.7.
* Fix - Fixed wrong amount displayed in the discount row of the Order details when displaying prices with tax included.
* Fix - Fixed deprecated ArrayAccess warning when fetching a property of a WC_Order_Item_Coupon object.

* Fix - Fixed wrong Order total when applying a discount to the shipping costs and the coupon is not applicable to all cart items.