Features: Calibrate menu with 2 and 3 Point screen calibration, the
latter which uses a low point in the center to
give greater range for cases where lower part of the screen does not
need to be accessed. Added all options in demo as Leap controllable
buttons. Added ability for OLKScratchButton to have customizable
hotZones to allow for tolerances in proximities to button for entry,
exit, and triggering states.

Fixed: misc bugs.