Zombie shooter (not finished yet)

Thanks to everyone who helped me solve the problems in the discussions.

Controls:
rotate by moving your mouse
"w/s/a/d" - move in direction
"shift" - sprint
"space" - shoot
"r" - reload (ye, the reload is instant)
"i" - show/hide info menu
(there will be more)

Please share anything that could make the code "look better", it works fine, but it's my first project and I know it's a bit messy. There is a lot more work to do and I plan to add many more things, so if something looks weird, you know why.