WooCommerce Gravity Forms Product Add-Ons 3.6.6

* WC and WP Compatibility Tags.
* Add AJAX manager to help with AJAX compatibility issues with various themes and page builders.
* Update: Do not automatically set the tabindex flag for the attributes of the form.
* Update: Resubmit as default for reorders.
* Fix: Add error correction code around reorder logic.

* Fix: Fix for Nested Forms by toggling AJAX only when the parent form is rendered.
* Fix: Resolve warnings regarding $err_level
* Update: Add Product SKU to the exportable fields list from Gravity Forms Entries.
* Update: Update the form's created_by field to the customer ID early in the process so that it's available to submission hooks.
* Update: Move export functionality to separate class.
* Update: Add additional fields, such as the product SKU, to the exportable fields list from Gravity Forms Entries.
* Update: WC and WP Updates.

* Fix: Fix for Nested Forms by toggling AJAX only when the parent form is rendered.
* Fix: Resolve warnings regarding $err_level
* Update: Add Product SKU to the exportable fields list from Gravity Forms Entries.