Magic Cube

Minor tweak.

Make the top three controls in the Play state reach all the way from the left to the right edge of the screen.

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

Report to Firebase exceptions with dismissing the Main Dialog.

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.