[Call for testing] New utility: audio(8)

I just committed a new audio(8) utility for viewing and modifying (some)
sound card settings, in similar fashion and format to mixer(8). The goal
of this utility is to concertrate audio settings under one user-friendly
utility, instead of having to (always) deal with sysctls and
/dev/sndstat. The driver-specific controls remain as sysctl-only though,
at least for now.

It prints a lot of information, some of it possibly unnecessary. Some of
the control names or their functionality might be non-obvious. But I
want to start improving those things once I feedback starts coming in.
There are already things in my TODO regarding improvements, but they
will happen gradually.

Please try it out and let me know what can be improved, added, removed.
The man page explains what each control does and whether it is
read-only/read-write.

Christos

[1] https://cgit.freebsd.org/src/commit/?id=44e5a01508353cfa52e185a531cfb5a6b39b28f6