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.

dat/dungeon.lua

@@ -6,6 +6,7 @@ dungeon = {
       base = 25,
       range = 5,
       alignment = "unaligned",
+      themerooms = "themerms.lua",
       branches = {
          {
             name = "The Gnomish Mines",