moved touch gesture interpretation from TwoFingerTrackball to
PointerGroup, and made all layers work with PointerGroup objects rather
than groups of 8 integers
converted tap handlers to work with pointer groups too, rather than
ints.

Added convenience methods first, second, last to pointerGroup
removed the control flow distinction between one and two fingers
renamed TwoFingerTrackball to Trackball
removed selection trackball so I can refactor the trackball into a
global resource. I'll work on the camera trackball
deleted AnimationTouchDispatcher
moved distance from Trackball to Camera, and started implementing a
trackball update listener
Added a task list since I keep forgetting my next steps
changed target api from 17 to 19
added frame picker to the layout, and made it draw only real frames
added several looped animations to the assets. Taken from the SL internal
animations
moved frame picker to the bottom of the screen (it was in the middle)
added the necessary support for action bars. next commit will rearrange
the ui using action bar rather than buttons
added a bunch of action bar icons to the project that I may or may not use
changed - to _ in icon filenames to match name requirements
added gyro on/off buttons to the action bar
the gyro toggle in the action bar now works
removed all the extraneous buttons that the action bar and new UI replaces
made the action bar transparent
moved the debug text down so it doesn't overlap the action bar
changed the startup animation from a blank T-pose to a dance