WooCommerce Bookings 2.2.0

* Fix - Bookable products with multiple resources incorrectly showing fully booked on calendar.
* Fix - Load created bookings including buffer time to check for availability.
* Fix - Booking day duration not considered in the REST API.
* Tweak - Include metadata of an order item in the Booking screen.
* Tweak - Introduce feature to enable use of self owned Google Calendar API application for calendar synchronisation.

* Fix - Replace deprecated jQuery methods.
* Fix - Fix end times drop down for multiple resources.
* Fix - Do not combine resources availability rules if no resource is selected.
* Fix - All blocks were available when block end time was between 0000 and 0059.
* Fix - Fix admin month date picker not working for certain languages in Firefox.
* Fix - Fix a case of end times becoming available when they shouldn't.
* Fix - Account for different block lengths during availability calculation.
* Fix - Bug when switching days on calendar if duration is greater than 1.
* Tweak - Send admin email notification when unpaid bookings are canceled.
* Tweak - Tweak restricted days display when editing.

* Fix - WordPress 5.5 REST API compatibility changes.