Player movement rework

Hey!

So I've been working on revising the player movement to make it closer to what you'd find in Garry's Mod/Half-Life 2 to allow faster-paced chases. I plan on working on this a bit more in the future as well as adding additional maps. 

I'll probably end up adding an additional gamemode where the goal is to survive as long as possible since I don't think the collect 6 keys gameplay mechanic will work really anywhere but the maze.