Fix copy-paste frames operation when the timeline layout changes
Now "application/x-krita-frame" mime type also saves the UUID of the source node, so pasting the frames after the row layout changed is still valid. The patch also implements a new version of KisAnimationUtils::createMoveKeyframesCommand which is safe to use when the frame moves have cyclic dependencies (one frame is going to overwrite another frame during the move). Theoretically, we don't need to use sortPointsForSafeMove() anymore. But it should be tested.
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