Added gun sound, generalised sound thing coming up soon
Tweaked stuff
Kludgy tilegrid drawing to spritebatch (HUGE Draw performance boost: 20 to 60fps at 1024*600 on my laptop)
To unkludge, needs tilesets in ONE image and quad usage, can do soon, but I'd like to work with Hannes on gfx so I can see fail points
Also, added auto-fullscreening (not actually fullscreen , but can be changed by switching "false" to "true" in main.lua line 5