Relax objectlib's requirements: it can be displayed not only on top of a DistortedScreen, but any DistortedFramebuffer.
1) introduce possibility to move objects, i.e. display them not in the middle of the screen (not fully functional yet)2) do away with unneeded any more interface 'EffectController' - since ObjectPreRender is the only implementation now.
Move yet more code to objectlib.