Make all tools output to stdout (pw-mon mostly) so that we can pipe the
output around.
Send errors to stderr.
fprintf(stdout, ...) -> printf(...)
setlinebuf for stdout so that pipe works better.
See #2110
This also brings the advantage that all tools, examples, modules, components
can also be compiled standalone out-of-tree using libpipewire from the system
Some PulseAudio clients are known to use localised client and
stream names as values for the respective PulseAudio props, most
notably plain old pavucontrol.
We call setlocale before anything else for ncurses to display
localised text correctly. We also want to link with ncursesw, which
supports multibyte Unicode locales.
