Major Controls Update

I changed the game drastically in this update. I've had complaints about the firing system, and decided to do away with the mouse as it merely served to confuse players. Now the player presses 'm' to fire.  Admittedly, this comes with a trade-off, as the player can no longer aim from a fixed position... but from what I saw, my friends weren't making use of this anyway (they didn't notice they could aim)... maybe if the cursor change properly displayed in HTML5 I wouldn't be having this discussion... but overall the change is for the better, and may even result in a mobile version (eventually).