move data types, like FlatND and InterpolatorND, to a separate package.
comment cleanup in DistortedObject.
cleanup in DistortedObject's methods.
remove the remains of DistortedBitmaps from DistortedNode
Bugfix for removeByType
Save PNG effect almost finished. Supporting App (hopefully!) completely finished.
What remains to be done: put actual saving of the Bitmap in a separate thread, away from the Graphics thread!!
Beginnings of support for the SavePNG effect.
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