User specified device args
Added possiblity for the user to specify an argument string related to a particular hardware. Details are here
For now this is actually applicable to the redpitaya driver of SoapySDR. You can use this to specify the address of your Red Pitaya with for example addr=192.168.1.40.
Other changes
- FreeDV demod: use mainstream library from codec2 instead of internal. The
libfreedvinternal library is removed. - Various code fixes based upon report of PVS Studio. Thanks to mamborambo for providing the report.