Suggestion: Add morphed "rotation" setting

[veqtor]

So, when playing with vectalign I noticed that it fails a lot of the time when trying to morph between assets where the "centerline", that is, the visual rotation axis where two assets should meet at an intermediary representation, isn't aligned. Take a play and a pause icon for example: The play icon is "visually", with respect to its symmetry, rotated 90 degrees clockwise relative to the pause icon. Rotating the play icon -90 degrees before morphing generates a much smoother transition. Solution would be to add a rotation to one/other of the assets in the transition.