Simplify set-block by using assoc-in.
Add set-pill-eaten, refactor add-score to take points parameter; (don't) draw pills correctly when they've been eaten.
Refactor set-pill-eaten, set-biscuit-eaten to use generic set-eaten function.
Add dumbest possible working tube behavior.
Remove :eaten-count in eaten-pill; remove :next-whole from :user; make pacman eat from the block he's on rather than the next one.
partially functioning next level behavior (add board-empty?, set-next-level functions)