Shaped and themed rooms

Allows creating shaped or themed rooms for the Dungeons of Doom
via lua script.

Invalidates bones and saves.

Makefiles updated for unix/linux by adding themerms.lua, but other
OSes need to have that added.

src/mkmaze.c

@@ -996,6 +996,7 @@ const char *s;
     if (*protofile) {
         check_ransacked(protofile);
         Strcat(protofile, LEV_EXT);
+        g.in_mk_themerooms = FALSE;
         if (load_special(protofile)) {
             /* some levels can end up with monsters
                on dead mon list, including light source monsters */