* Fix - Issue where PHPMailer errors were not retrieved correctly
* Fix - Remove deprecated usage of the "WC_Order_Item" class
* Fix - Incorrect use of undefined WC_ADMIN_APP constant (from 5.0.2)
* Tweak - Removed usage of the deprecated "woocommerce_before_cart_item_quantity_zero" action
* Fix - Manual workflows not working with variable timing
* Fix - Numeric rules not matching decimal values
