Reconcile SDRPlay gains with SoapySDR abstractions#27

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dlaw wants to merge 4 commits intopothosware:masterfrom dlaw:new-gain-controls

+170-41

Commits on Jan 3, 2021

added support for IFGain, RFGain and gain (0-29)

SDRplay
authored and
dlaw
committed
fix: rename gain controls 'IF' and 'RF' and keep the old 'IFGR' and 'RFGR' without listing them for backward compatibility

fventuri
authored and
dlaw
committed

Commits on Jan 4, 2021