Replaces the reflexive instantiation of the Renderes with a factory
method.
Some optimizations to the renderers to no longer push the whole OpenGL state to the stack.
General cleanup of duplicate code, etc
Reduces the visibility of all fields to private and create setters/getters
when necessary. Exceptions are fields with GuiSync as these need to be
public.
Reduces the visibility of internal methods to private/protected/default when possible.
