* add player scene
* add some logic to control player velocity
* add debug scene and reset main scene
* add sun and env to debug scene; fix normalization of movement
* add kenney WIP assets for debug
* fix movement further and add jump
* add mouse camera control
* add sprinting
* add crouching
* use constants for height
* try to improve crouching by checking to see if there is a collision above before un-crouching
* update README about line width
* move test cube in front of playercontroller
