(svn r3767) Move all direction related enums and functions to a separate header

tile.h

@@ -20,41 +20,6 @@ typedef enum TileTypes {
 	MP_UNMOVABLE,
 } TileType;
 
-/* Direction as commonly used in v->direction, 8 way. */
-typedef enum Directions {
-	DIR_N   = 0,
-	DIR_NE  = 1,      /* Northeast, upper right on your monitor */
-	DIR_E   = 2,
-	DIR_SE  = 3,
-	DIR_S   = 4,
-	DIR_SW  = 5,
-	DIR_W   = 6,
-	DIR_NW  = 7,
-	DIR_END,
-	INVALID_DIR = 0xFF,
-} Direction;
-
-/* Direction commonly used as the direction of entering and leaving tiles, 4-way */
-typedef enum DiagonalDirections {
-	DIAGDIR_NE  = 0,      /* Northeast, upper right on your monitor */
-	DIAGDIR_SE  = 1,
-	DIAGDIR_SW  = 2,
-	DIAGDIR_NW  = 3,
-	DIAGDIR_END,
-	INVALID_DIAGDIR = 0xFF,
-} DiagDirection;
-
-static inline DiagDirection ReverseDiagDir(DiagDirection d)
-{
-	return 2 ^ d;
-}
-
-
-/* the 2 axis */
-typedef enum Axis {
-	AXIS_X = 0,
-	AXIS_Y = 1
-} Axis;
 
 void SetMapExtraBits(TileIndex tile, byte flags);
 uint GetMapExtraBits(TileIndex tile);