WINTERMUTE: Introduce dirtyRectContainer
WINTERMUTE: Hook up BaseRenderOSystem with DirtyRectContainer
WINTERMUTE: Add outlining in BaseRenderOSystem for visually debugging rects
WINTERMUTE: Add support for bailing out in multirect
WINTERMUTE: Add consistency check to mutlirect
WINTERMUTE: Trigger drects bailout just once
WINTERMUTE: Integrate multirect with old style gigarect for fallback
WINTERMUTE: Allow for extending clipRect in a frame in dirtyRectContainer

This can happen.
WINTERMUTE: Add SmartList-friendly debug rects
WINTERMUTE: Update comments and formatting in DirtyRect