Amenitiz + BookingLayer Integration

Keep Amenitiz and BookingLayer aligned: when scheduling events happen in one, update the other automatically.

Example: when Amenitiz's "Watch Availabilities" fires, WEXTL can "Batch Update Lines" in BookingLayer. Amenitiz has 3 triggers (including Watch Availabilities, Watch Recently Created Bookings, and Watch Recently Updated Bookings); BookingLayer has 41 actions (including Batch Update Lines, Create a Guest, and Create an Invoice).