Add option to force M4A audio track or block other audio codecs

[anakin94]

Hello, in default YT uses OPUS audio codec even for music. But the OPUS track is upsampled to 48000 Hz. Music is mostly at 44100 Hz and the M4A track keep the original sampling rate.

The addon supports changing the video codec or blocking an video codec, but not for audio. Please add this feature also for audio.