Info: WordPress v5.9 compatibility
* Fix: `Uncaught TypeError: method_exists` which sometimes occurred in the context of the `list-helper-functions.php` file
* Info: Updated plugin updater to version 1.9.1
* Fix: Improved escaping on settings page to address XSS concerns
* Info: WordPress v5.8.3 compatibility
* New: Included "max_input_vars" in debug information
* Tweak: Using new endpoint for license & update server requests
* Info: Updated plugin updater to version 1.8
* Info: Updated translation files
* Info: WordPress v5.8.2 compatibility
* New: Added `rel="sponsored"` to all outgoing Amazon affiliate links
* New: Added `rel="noopener"` to all outgoing links with `target="_blank"`
* Fix: Currency symbol/format for Amazon.se was incorrect
* Info: Updated all template files
* Info: WordPress v5.8 compatibility