Added support for detecting eye winks and double blinks. Tries to
determine if the user is falling asleep through a scoring system. Winks
and blinks add to a "sleep score" which degrades over time. If the sleep
score is over a threshold, the app determines the user might be falling
asleep and speaks a message, as well as opens the menu (which has an
option to get directions to a rest area or stop the app).

This is currently untested.