0x1  makes it impossible to move diagonally from a tile to the one south-east of it
	0x2  makes it impossible to move south
	0x4  makes it impossible to move diagonally from a tile to the one south-west of it
	0x8  makes it impossible to move west
	0x10 makes it impossible to move diagonally from a tile to the one north-west of it
	0x20 makes it impossible to walk north
	0x40 makes it impossible to move diagonally from a tile to the one north-east of it
	0x80 makes it impossible to walk east