add support for jack audio connection kit #260
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Hi, I've created simple JACK backend for librespot. It's just a simple initial implementation. But it works quite good. It seems to be better than
using portaudio (to access JACK) or pipe backend with jack-stdin.
Commit message follows.
This is initial support for JACK. It creates ports at startup and
keeps it connected while librespot is running. So when librespot
playback is stoped it writes silence (zeroes).
It uses jack crate (rust-jack) which needs libjack. To compile in
jack support use --features jackaudio-backend. And run librespot
with --backend jackaudio.