pipewire's client.conf sets the default log level to 0, which is not
good for wpexec, as lua runtime errors are reported as warnings currently.
Also, let's use fprintf() for local cli errors to make sure they get printed
even if the log level is 0
We have ended up not using them, so let's not carry them
in the ABI of 0.4
We can always revert that, but let's first decide how
these objects should be used
This is mainly for security reasons. This way, we can limit the
permissions of wpexec without limiting wireplumber, for instance
with pipewire's default module-access, which limits apps based on
their executable name
