Stores the map, in bitmap style. Each tile of
the map is stored as four bytes. Each of these
bytes maps to a different object in the MCD array.
The first byte is the ground.
The second is the west wall.
The third is the north wall.
The forth is the contents (not objects - dirt and stuff).
Tiles are stored in order of left to right,
top to bottom, top floor to bottom floor.

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