Saving/reading settings works now. Need to add saving/reading for Leap
Calibration.

TODO:
0) Order X-box wireless receiver.
1) Finish implementation of Leap Calibration (save/read calibration).
2) Implement Gestures/rendering.
3) Implement Swipe keyboard.
4) Implement interpolation trail/rendering.
5) Implement Screen Swipe for other keyboards.
6) Design Experiment UI / let keyboards know when experimenting to
record data.
7) Create file path relevant to current subject. Add lock-in subject
button on Control Center.
8) Save streamed data in graph-ready format.
9) Record key presses (mistakes included), reaction time: whole words,
each letter, swipe.
10) Create Survey UI / Save data to relevant data path.
11) Create Tutorial UI -- add a tool to read saved data and play it back
-- "Tutorial video"