fixed SSB demod, default samp_rate is now 1e6, enabled power squelch gate in an attempt to reduce audio underruns, adjusted volume
Merge branch 'master' of https://github.com/m0mik/scanoo

scanoo updates

- removed WBFM demodulation
- LSB/USB fixed missing decimation and adjusted complex bandpass filter settings
- changed default sample rate to 1e6 for greater compatibility
- enabled gate feature of power squelch block to reduce audio underruns
- decreased squelch alpha rates for longer hold time
- adjusted volume settings