New Pager demodulator
Thanks again to Jon srcejon this new plugins demodulates and display data and messages from Pager transmitters. For now only POCSAG protocol is supported. THis implements issue #738 More details here: https://github.com/f4exb/sdrangel/blob/master/plugins/channelrx/demodpager/readme.md
Other changes and fixes
- AIS feature: use course if heading is not available
- Satellite Tracker: fix table to accomodate Doppler tracking. PR #951. Issue #840
- SDRPlayV3: wait for some commands completion. PR #954
- Spectrum Markers: make them stick to frequency, power and time distance
- Fix handling of Satellite Tracker device settings. PR #959. Issue #953.
- Channel Analyzer / Scope: fixed sample rate handling. Fixes #956
- ScopeVis: added missing mutex locks in message handling. May fix #955
- ScopeVis: do not save / restore time offset in the settings
- ScopeVis: fixed multiple stream input. Fixes #872
- RadioClock and Pager: some optimizations
- SSB demod: fixed bandwidth setting. Fixes #957