Magic Cube

Abstract the next function, computeRowFromOffset(), out of the individual Movement classes.
Still two issues:

1) mysterious 1.5 multiplier in Movement12
2) in Movement8, moving the offset works only if the rotAxis are face-turning, i.e. they connect the centers of the opposing faces of the octahedron.

Minor

Abstract out some methods from the Movement classes. only two remain now: rowFromOffset and enabledAxis.