Point of Sale for WooCommerce 6.3.0

* Tweak - WC 4.0 compatibility.
* Feature - support WooCommerce Sequential Order Numbers by SkyVerge.
* Tweak - option to print refund receipt.
* Fix - refunding orders with product stock at 0 was not working.
* Fix - refunding orders and not restoring stock was not working.

* Fix - holding orders final panel would not dismiss.
* Fix - country would not appear in outlet page.
* Fix - opening float amount only appears if note was left.

* Fix - encode special characters in product categories on the product grid.
* Fix - orders that are refunded will have updated status in orders tab.
* Fix - when refunding custom products product value was incorrect.
* Tweak - prompt if basket has product when user is closing register or switching users.
* Tweak - ability to go back and close payment capturing from screen.
* Tweak - button to copy billing address to shipping address.