ADC/OSD/RSSI/CLI Updates

Improved OSD CLI - easier to read, easier to use.

Fixed battery monitor scaling - still don't have currentUsed correct
but the voltage and instantaneous current readings are functioning
properly now.

Fixed RSSI reading, functions properly now

Added some error checking to OSD and parts of Sensor CLI. Will add more
if you think this is a good route.
…github being odd

Improved OSD CLI - easier to read, easier to use.

Fixed battery monitor scaling - still don't have currentUsed correct
but the voltage and instantaneous current readings are functioning
properly now.

Fixed RSSI reading, functions properly now

Added some error checking to OSD and parts of Sensor CLI. Will add more
if you think this is a good route.