SoftRF version MB203

[Moshe Braner]

Now posted on github.  https://github.com/moshe-braner/SoftRF

Some of the changes since MB202:

Fixed bug that caused very bad reception sensitivity on the sx1276 (T-Beam).  Also adjusted some other details in the sx1276 configuration: bandwidth, AFC, LNA boost.

Adjusted "airborne" speed thresholds for paragliders.

Avoid generating collision alarms while being towed (or towing).

Receive and decode old-protocol PilotAware messages.  (But only transmit in new ADS-L-based PAW protocol.)

Transmit & receive FLARM messages (callsign, pilot name, aircraft type, and aircraft registration).  On reception, output as $PFLAM NMEA sentences.

Transmit & receive FANET pilot name and ground status messages.  On reception, output as PFLAM sentences.

Outgoing messages can report a distress situation, possibly automatically.