[MF_U]
Adds a new column to the "hatch lock events" table that allows you to lock a door until the event specified has passed.

Usage:
Each row in the table has 5 columns (Event number, area number, room number, hatches to lock flag, lock until event passed flag)
When the "lock until event passed flag" is set, the hatch will remain locked until that event has passed

Example data: 0x0A,0x00,0x18,0x01,0x01
In this example the door towards the elevator in room 0x18 on the main deck (0x00) will stay locked until EventCounter > 0xA