board calls update on all tiles
more vector math
sprite colors, rendering
working on an idea for caching canvas drawings
setup camera in game.setup, board does not take keyboard input anymore
removed a lot of drawing code no longer in use
tiles are not going to directly hold on to items
not handling items this way anymore, removing old code
new mine design, purple/red
removing old item  code
verify args is array
better comments in PQ
stop iterating over all tiles on board, only worry about tiles in the camera view
trying out canvas context  save/resore, rather than re-translating - seems to work well
make board.exists() a little more understandable
modulate the animation speed for Sprite, needs some cleaning up, but it works
added try/catch for now, there is a problem i think with the way the camera start/end are calculated
experiment with caching canvas drawings - might not add as much benefit as i thought
do not need to repeat frames now that i have animation speed working
faster and less obscure way of clearing canvas