GPS - minor code readability improvements.
GPS - adding a fixme regarding 'ap_mode' variable.
GPS - cleanup nagivation reset flag usage.
GPS - Demystify some magic numbers.
GPS - Add packet logging to the OLED display.  Allow autobauding to be
enabled/disabled via cli (disabled by default now).  Fix missing rate
configuration for UBLOX SVINFO which would have resulted in missing
satallite counts.