Magic Cube

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.

Lock screen orientation to portrait.

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.

Improvements for the way we rotate layers of Objects: make it possible to begin a rotation during a WIN effect.

Improvements for the way we rotate layers of Objects. (take the speed into account - so even if we rotated a layer of a Cube to less than 45 degrees, but we did it fast, do a 90 degree rotation!)

Only compile the Full, Normal & OIT programs when they are actually needed.

Take advantage of recent improvements to the library and stop allocating a queue of 4 FBOs - even if we are running on a Mali r12.

Smaller (and of better quality!) meshes.