WooCommerce Product Documents 1.15.3

* Fix - "Translations loaded too early" error
* Misc - Tested up to WooCommerce 10.2
* Misc - Improve escaping and sanitizing throughout codebase
* Misc - Update the SkyVerge Plugin Framework to v5.15.12

* Fix - Prevent shortcodes from outputting data for products that should not be accessible to the current user

* Misc - Require PHP 7.4 and WordPress 5.6