Checkout for WooCommerce - CheckoutWC 9.1.8

Fix - Fix bug with one page checkout not firing order submit handlers properly.
Fix - Fix styling bugs with content loader.
Fix - Fix JS errors with Amazon Pay.
Fix - Fix bug with create account checkbox not auto checking.
Fix - Fix PHP 8 deprecation notice.

Hotfix: Fix issue where billing address fields weren't synced from shipping address fields.
Fix: Fix glitches with admin bar
Fix: Fix issue with view order URL being styled incorrectly
Fix: Fix issue with styling of checkboxes
Fix: Fix issue with Canada city being filled improperly with Google Address Autocomplete.
Fix: Fix issue where Amazon button could render incorrectly for a few seconds.
Improved: Added mechanism for custom validation of custom fields with parsley.js

n/a changelog