load levels and put the player in them

[jrheard]

right now, my favorite algorithm for this is the cellular automata one. but it can have islands/subcaves, and we currently don't fill those in.

so, do these things in order:

1. manually construct and save a particular 2d grid level
2. pick a point on the level to put the player in
3. turn the grid into a list of (e/wall) entities
4. get the game running with the player in there
5. implement a flood-fill system that fills in small subcaves
6. write a function that picks a starting point for the player in empty space
7. undo step 1, hook up random level generation to this system

[jrheard]

nah, let's do flood fill first