AirspyHF new settings
Implemented new settings that come along newer version of libairspyhf. Most of them work only on HF bands:
- AGC
- LNA
- Attenuator
The DSP provided by libairspyhf can be disabled. Consequently it is possible to use SDRangel internal DC block and IQ correction.
REST API fixes
Many little glitches fixed following more complete support in the client application
Other fixes
- SoapySDR: on preset load match on serial or driver id for SoapySDR devices
- SerialDV: corrected cmake find module and improved SerialDV support error messages
- Make the settings location appear in the log and in the about panel of the GUI also
- Temptative XTRX fixes
- REST API examples: Added a randomize channel colors utility as a way to answer to issue #275