Corresponds to whether the player has already seen the image for the following rooms:

Bit	Room ID	Room Name
00	03	Your Ship
01	08	The Dunes
02	09	The Dunes
03	0A	The Dunes
04	6C	The Bridge
05	3E	The Cave Mouth
06	6A	The Mighty Rock Door
07	1F	The Cannibals' Village

Bit	Room ID	Room Name
00	28	The Cliff Path
01	29	The Cliff Path
02	2A	The Cliff Path
03	52	The Vast Cavern
04	62	The Pirate Treasure Chamber
05	N/A	N/A
06	N/A	N/A
07	N/A	N/A

Handler_DisplayRoomImage tests and sets the bit for the current room. The bit number is the room's place in Table_RoomsWithImages.