Fix - Added box-packer composer.lock file to keep library versions exact.
* Fix - Fatal error: "Uncaught TypeError: sizeof()" thrown on PHP 8.0.15.
* Tweak - Update debug message to include product ID.
* Tweak - WC 6.3 and WP 5.9 compatibility.
Fix - Missing Languages folder and .pot file in release-ready zip file.
* Fix - Remove flat rate board game box as it is no longer supported by the API.
* Tweak - WC 5.9 compatibility.
Fix - Incorrect USPS User ID notice shown for sites with existing USPS method instances.
Fix - Remove default user ID "150WOOTH2143" as it no longer available.
* Fix - Unpacked items returning API rates when supposed to ignore.
* Fix - Allow found rates to be filtered.
* Tweak - Show the specific rate label when only offering customers the cheapest rate.
* Fix - Double debug notice in checkout page.
* Tweak - Move Shipping Rates (Commercial|Retail) option out of API rates section.
* Add - Add options to USPS settings for overriding default product dimensions/weights.