Simplify main-draw function; remove eat-ghost, check-danger, map-pos functions (all unused.)
Modify draw-block to accept a coord rather than an x/y
Replace block function calls with board-pos; remove old-refresh-user-data, pane function.
Reorganize declare statements.
Change dorun to doseq in draw-ghosts; reorganize some chaining calls; rename amatrix adjacency-matrix.
Make adjacency-matrix work.
Add distance, shortest-distance functions.
Add next-direction function.
Add shortest-direction function, add hunt-pacman strategy for ghosts.
Move adjacency-matrix into game state; (too-good) functioning hunt-pacman
Change next-direction to next-directions; add working shortest-path function.