Kc fix toggle

This adds some text on the screen to display whether or not zombies are active and how many are alive. I also renamed some bindings to match our control scheme, uploaded the graphic that will *hopefully* replace the mouse cursor, and added the ability to run (hold shift)!

Note: you can only run while moving forward, as running backward isn't really feasible. I thought about having a 'backing up' speed that is like, half of his regular walking speed.. I dunno.