Fix Digger's use of pairs causing indeterminate results.
Added some stuff to Dungeon so this can be used for other map generators if we feel like it (just to get rid of string concatenation / pairs; doesn't look like there are any other problems with determinism right now).
Digger example uses key pressed as seed, so you can keep hitting the same key and verify the dungeon is always the same.
Fix Digger's use of pairs causing indeterminate results.
Added some stuff to Dungeon so this can be used for other map generators if we feel like it (just to get rid of string concatenation / pairs; doesn't look like there are any other problems with determinism right now).
Digger example uses key pressed as seed, so you can keep hitting the same key and verify the dungeon is always the same.