20231216-0

Removed recording buffer thread. This will simplify the audio output operation. Also, lowered the output level of AM/CW/USB/LSB/WSPR decoder to prevent audio clipping, and changed the IF AGC constants for longer transition timing.

What's Changed

• Remove output audio thread by @jj1bdx in #46
• AM Decoder AGC fix by @jj1bdx in #50

Full Changelog: 20231215-0...20231216-0