* Tweak - Display add-ons labels in order review section
* Tweak - Add add-ons required status indication to the admin add-ons table
* Tweak - Add filtering of add-ons according to required status
* Fix - Fix an issue that caused some add-on fields to lose focus during editing
* Fix - Prevent a JavaScript conflict with Secure Trading Gateway for WooCommerce plugin that causes the Place Order button to stop working
* Fix - Fix an issue that caused some add-on fields to ignore their default values
