WooCommerce Google Product Feeds 11.0.14

* Update: Optimise regular expression processing of product descriptions
* Fix: Resolve issue with Currency Switcher For Woocommerce integration

* New: Add filter (woocommerce_gpf_include_image) to allow image exclusion
* Update: Make sure image_link is a proper URL in case something has made it relative
* Fix: Resolve issue where invalid data from WooCommerce Additional Variation Images could cause integration to fail
* Fix: Resolve issue where prepopulations from Germanized for WooCommerce weren't rendered properly in the feed

* No user-changes. Repackaged for deployment testing.