* massive refactoring of renderers (introduced TickBasedRenderer)
* completely redone SideBySideRenderer and TopBottomRenderer (introduced ScalingRenderer) this should improve performance significantly
+ CheckerboardRenderer
* refactored InterlacedStereoRenderer and extracted StencilingRenderer
! fixed menu duplicating in SideBySide but button hit boxes are still at the old position (got rid of the duplication)