Refactor dungeon generation.

[ndouglas]

Currently, I have three "algorithms" for creating a dungeon: "simple", which is a slightly modified version of the code from the tutorial, "empty", which just creates an absolutely minimal map, and "random", which ostensibly chooses a random generator (but just points to the "simple" generator right now.

The game is currently based around the "simple" generator, which causes some problems (e.g. #17).

Ultimately, I would like:

• a number of different generators that would generate different kinds of maps:
  • wilderness (several different kinds, for different biomes)
  • dungeon (probably several of these, just for variety)
  • maze (possibly a couple different kinds)
  • cave systems
  • town/city
  • combinations (cave/town? wilderness/maze?)
  • other ?
• some way of tying possible denizens to a given map, based on what would be somewhat compatible/reasonable to find there
• some way of influencing the inhabitants through the environment, a sort of environmental determinism
• etc

So, basically, I need to generate the map before populating it, then populate it from the bottom up and run a few turns before setting the player loose.

[ndouglas]

One possibility is to dump a bunch of critters in and have them evolve over a bunch of generations. Is that way too front-heavy? Too much startup delay? IDK. I do think it means I'd have to generate dungeons that are far more than 80x25, 80x50, or even 160x100 to be interesting... but I've had that thought anyway. Maybe I need to generate systems of interconnected maps. Definitely not Dwarf Fortress levels of crazy, but something larger than a single map at a time.