explosions stop at explodeable things
added in some walls that cannot be knocked down
placed zooming into function
minor refactoring/moving some code around
send pressed keys to boardController too
moved some utility-type functions into their own place
getting exploding tiles to explode
manage exploding mines
player is killed when they are standing in on an exploding tile
player cannot walk on spaces where mines are present, starting on
drawing better player sprites
added temp ghost image for killed players