Fix the way we continue rotation: when rotating a layer, we need to be doing it with respect to the RotAxis which has been first casted to the touched face, and only then this casted one is casted to the surface of the screen.
Before we were casting the rotAxis directly to the screen without the intermediate casting to the face, which doesn't really work in case of the Dino: if the touched face is rotated away by quite a lot, the rotAxis is then completely counterintuitive.
Major progress with Dino; rotations (almost?) work now.
Introduce separate ROT_AXIS and FACE_AXIS ( step 2 )