WooCommerce PDF Product Vouchers 3.12.3

* Feature - Merge the Add Google Fonts free add on into PDF Product Vouchers core plugin
* Fix - Address a bug with TwentyTwenty theme which made the Voucher template customizer unusable
* Fix - Allow stores with different decimal separators than `.` to successfully redeem vouchers in the admin area
* Misc - Add PHP 8.0 support
* Misc - Update DomPDF library to to v1.0.0
* Dev - Add filters to allow disabling low memory and Sucuri admin notices

* Tweak - The "included tax label" will be hidden if a voucher for the full order is applied
* Fix - Prevent the disabled WP Cron notice to be visible after dismissed
* Localization - Update German translation and add German Formal translation (Thanks to Manuel!)
* Dev - Add a `wc_pdf_product_vouchers_should_hide_tax_label_from_cart_total` filter to override the hiding tax label tweak
* Misc - Add compatibility for WooCommerce 4.7

* Misc - Remove the SkyVerge help menu item as part of the plugin assets