common scene: complete scene tranfsormation feature.

common scene: complete scene tranfsormation feature.

Each scene could conserve its own transformation,
the origin could be the parent Paint (if they were beloned to)

Thus, you can compose the multi-tranformed scene group which
simultenoulsly working in own spaces.

See testTransform and testSceneTransform, how they work.

Change-Id: I51deb4d66f8fcd024f8dc7a1e1af57c398a9d7fe