Magic Cube

Move the 'Effects' thing to a button in the Play state.

On object change, report FPS to Firebase

Two-fingered object rotation seems to be finished.

Progress with dragging.

Simplify dragging. Now there's only 1 Quat, rather than the old way with two (Accumulated, Current).

Progress with improvements for cube manipulation.

Initial attempt at two-finger rotation.
Mostly works; still, one corner case doesnt:

- put two fingers down, start rotating
- lift one of them up
- put it back down

depending if we lifted the first or second finger, weird things may happen.

Further improve rotations of a Object layer - make them independent of physical screen size (now it depends on the angle of rotation and, if that's 0, on the speed (in inches of second) of the finger swipe done by the user.

Make the rotations and drag be independent of physical screen dimensions - take into account pixel density.

Split up the onTouch() part of the View.