Added the basic SimplePhysics syste,

Simple physics has been added. Currently it just has a physics mover and
a view mover. These act on transforms and view respectively.
Removed useless lines and/or comments
ViewMover now takes rotational forces.
GLSixDOFViewController now uses view mover

By using a view mover component forces can be added and removed to the
view that are applied each physics system update and instead of during
key repeat messages.
Added the physics system to main

The main loop now sets the KeyboardEventHandler for view control. To
accomplish that is creates a view mover and adds it and the IGLView from
OpenGLSystem to the event handler.