WooCommerce Google Product Feeds 11.0.19

* New: Experimental support for Product Review feeds : Overview  |  Product Review Feeds  |  Google Developers
* Fix: Make sure wc_get_products args are filtered consistently every time they're used.

* New: Variation products now pick up additional images from product gallery.

* Fix: List of custom fields available for pre-population is now filterable via woocommerce_gpf_custom_field_list
* Fix: Custom fields that were only used on variations weren't available for selection
* New: Introduce filter to exclude attribute labels from variation titles (woocommerce_gpf_include_attribute_labels_in_title)
* New: Add support for energy_efficiency_class, min_energy_efficiency_class, and max_energy_efficiency_class in Google feed