* Fix: fixed issue where waitlist counts were showing as 1 by default when updated
* Fix: made settings text translatable
* Fix: fixed bug where updating waitlist counts when no products exist
* Fix: updated order->user_id to use new format order->get_user_id()
* Added in setting to update waitlist counts manually
* Added support for multiple parent products (grouped products)
* Added product ID to filter for disabling persistent waitlists
* Added product ID to filter for disabling automatic mailouts
* Removed auto updates of waitlist counts to avoid issues with large product databases
