[UPDATED] Quantity-Based Fee/Discount

Updated to v2023-5-01

Release Notes:
- Added: compatibility with OpenCart 4.0.1.x - 4.0.2.x
- Added: new "Check For Updates" button with one-click update functionality

- Fixed: problems when tooltips were disabled in OpenCart 4.0 versions
- Fixed: "Automatic conversion of false to array" error in PHP 8.1

- Updated: better guest detection for certain OpenCart versions

Updated to v2023-12-04

Release Notes:
- Fixed: billing address detection was not always correct in OpenCart 4.0.2.x
- Fixed: "Undefined index: Choose rule type" error when saving a blank rule

- Updated: the Testing Mode log size check now happens on the front-end rather the admin panel, to more reliably stop log files from growing over 50 MB

Updated to v2024-11-20

Release Notes:
- Fixed: warnings when a registered customer does not have an address saved

- Updated: saved rules are now sorted by type
- Updated: improved compatibility with the OpenCart 4.0 order editor for customer-based rules