this is the fail safe used for monitoring channel 3 from the radio, relaying its switch position to the main MCU board (i.e. teensy 3.1), and to toggling the muxer to enable/disable autonomous mode.

***NOTE: THIS CODE IS BROKEN, NOT YET WORKING, ETC***

Signed-off-by: rkburnside <richard@burnsides.org>
Merge branch 'teensy-3.1-initial-development' of github.com:rkburnside/minuteman into teensy-3.1-initial-development