PipeWire support

[orowith2os]

This seems to currently have support for ALSA and PulseAudio on Linux (judging from #33), and the linked pull request seems to make life easier in adding support for other sound systems.

The Linux desktop is currently in the process of making a transition to PipeWire, which improves upon the previous APIs in the following ways:

• Capture and playback of audio and video with minimal latency.
• Real-time multimedia processing on audio and video.
• Multiprocess architecture to let applications share multimedia content.
• Seamless support for PulseAudio, JACK, ALSA, and GStreamer applications.
• Sandboxed applications support. See Flatpak for more info.

(https://pipewire.org/)

PipeWire maintains compatibility libraries for PulseAudio and ALSA, however these still have some of the limitations of their display server. Native PipeWire support would be ideal, particularly as I plan on utilizing this inside of a sandboxed environment, and PipeWire is the only multimedia API that handles that without punching a hole in the sandbox. Aside from that, the other benefits likely don't matter much, but still may be useful.

I don't know C/C++, so I probably can't be of much help, but I can try.