Added timing code

Now win32 has timing methods to retrieve a delta change in time since
the last call. The change is in milliseconds.

You must call SetupTimer() before you call GetDeltaTime() in order to
establish the timer frequency.
Beginning of camera code

OpenGLSystem camera code is in place. Currently is only rotates or moves
at a static amount.

OpenGLSystem::Update() now takes a double to match the delta time input.
Additionally it only renders at a max of 60 fps.