Blocks are now rendered with the correct culling mode and rotated similar
to the icon itself, but slightly shifted to the left that the front
texture appears larger (This applies to items following the normal
minecraft rotation like furnaces)
Items are also now rotated a bit differently and more in line with their
item rendering as well as longer being mirror inverted.
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.