//Walls follow this naming convention: TI_WALL_ + B (if broken wall) + S (if secret wall) + 
//compass directions of any edges, (i.e. NWE means edges on north, west and east sides) +
//4-bit number representing indented corners, where 1 is northwest indent, 2 is northeast,
//4 is southeast, and 8 is southwest.  If no number is present, then no corners are indented.
#define TI_WALL_NW      663
#define TI_WALL_NW4     664
#define TI_WALL_NE      665
#define TI_WALL_NE8     666
#define TI_WALL_SW      667
#define TI_WALL_SW2     668
#define TI_WALL_SE      669
#define TI_WALL_SE1     670
#define TI_WALL_NWE     671
#define TI_WALL_NSE     672
#define TI_WALL_SWE     673
#define TI_WALL_NSW     674
#define TI_WALL_NSWE    675
#define TI_WALL_NS      676
#define TI_WALL_WE      677
#define TI_WALL_N       678
#define TI_WALL_N4      679
#define TI_WALL_N8      680
#define TI_WALL_N12     681
#define TI_WALL_S       682
#define TI_WALL_S1      683
#define TI_WALL_S2      684
#define TI_WALL_S3      685
#define TI_WALL_W       686
#define TI_WALL_W2      687
#define TI_WALL_W4      688
#define TI_WALL_W6      689
#define TI_WALL_E       690
#define TI_WALL_E1      691
#define TI_WALL_E8      692
#define TI_WALL_E9      693
#define TI_WALL         694
#define TI_WALL_1       695
#define TI_WALL_2       696
#define TI_WALL_3       697
#define TI_WALL_4       698
#define TI_WALL_5       699
#define TI_WALL_6       700
#define TI_WALL_7       701
#define TI_WALL_8       702
#define TI_WALL_9       703
#define TI_WALL_10      704
#define TI_WALL_11      705
#define TI_WALL_12      706
#define TI_WALL_13      707
#define TI_WALL_14      708
#define TI_WALL_15      709