Numerous changes to terrain and trim. The changes to the scneario editor work as expected.

- New way of drawing walkway (doesn't work yet)
- New way of drawing roads (doesn't yet work correctly)
- New way of drawing trim (not tested yet)
- New way of handling marked specials (works in editor but not in game)
- New way of handling two-space rubble in the editor (works as expected)
- Merged several terrain special properties
- Deprecated several terrain graphics
- Completed (probably) the import & convert code for old-format terrain
- Probably other things that I have forgotten that have something to do with terrain
- A few other little things, bugfixes, etc

git-svn-id: http://openexile.googlecode.com/svn/trunk@56 4ebdad44-0ea0-11de-aab3-ff745001d230

osx/boe.consts.h

@@ -159,6 +159,16 @@ enum eGameMode {
 #define STATUS_PARALYZED		12
 #define STATUS_ACID				13
 
+// Directions!
+#define DIR_N	0
+#define DIR_NE	1
+#define DIR_E	2
+#define DIR_SE	3
+#define DIR_S	4
+#define DIR_SW	5
+#define DIR_W	6	
+#define DIR_NW	7
+
 /* damage type*/
 /* used as parameter to some functions */
 enum eDamageType {