WooCommerce Gravity Forms Product Add-Ons 3.6.6

* Update: Include new filter woocommerce_gforms_order_item_meta to allow filtering of order item meta data just prior to it being added to the WC order item.
* Update: Perform a check before adding order item meta data to prevent duplicates. This could only be caused if the filter was being called incorrectly twice for some reason.
* Update: Include new filter woocommerce_gforms_get_cart_item_total to filter the gforms total to be added to the cart item.
* Update: Include the ability to attach a gravity form to a products bulk input form when WooCommerce Bulk Variation Forms are in use.

* Update: Tested to WC 3.5.3
* Update: Tested to WP 5.0.2
* Update: Fix issue where 0 values were not being displayed in the cart.
* Fix: Fix for validation errors when the user fails to fill out all the required fields on a form more than once.
* New: Add option to display totals section before the form. Helpful for multi-page forms.
* New: Include separate Bulk Variations Form selection option. Fixes issues with duplicate forms being rendered.
* Fix: Fix issue where the setting for Replace Modified Items was not being saved.
* Fix: Fix issue with the gform_product_total and not respecting the Use Dynamic Pricing filter.
* Fix: Fix warning in PHP 7.3 about continue inside of a switch statement.

* Update: Use basename() for file names rather than attempting to parse ourselves.
* Update: Add hidden class to the metaboxes to help fix up some bouncing in the UI when editing products.
* Update: Add additional arguments to the woocommerce_order_item_display_meta_value call on the order screen.
* Update: Tested to WC 3.5