WooCommerce Google Product Feeds 11.0.19

* New: Support for product weight with & without units as pre-population options
* New: Include overview of database in status report for improved debugging
* Change: Internal changes to taxonomy freshness checking
* Change: Responsiveness improvements to taxonomy autocomplete performance

* Fix: Resolve issue where taxonomy cache table could grow beyond expected size and cause performance issues

* New: Allow Google Product Category to be populated from multiple locales
* New: Support 'promotion ID' in the Bing feed
* New: Prompt for feedback
* Fix: Resolve warning thrown when multicurrency integration active
* Fix: Resolve issue where availability field could be missing in Bing feed