I made an "enemy"

I created a second player (enemy) to home in on the first one. I also
removed gravity to see how the enemy would behave. I think friction will
have to be added for the enemy to ever hit the player and not move
periodically.
Edge Detection slightly updated

I started putting thought into friction, but decided it was an
implementation for later. Friction requires two objects interacting.
This should be the job of the physics engine. For now I added an
animation and rotation to draw the image running on different walls.
Physics Stuff has turned into display stuff

started working on a display class to handle all objects that need to be
displayed in it. Still need a way to make coordinates relative to the
display.