Previously, pw_init calls setlocale(), but this will change in future.
Setting the locale should be done by the main application, and is needed
in wireplumber for e.g. for translated UI elements.
Set the locale in main() for wireplumber daemon and tools, to have the
locale set also with the new pw_init behavior.
Set also LC_NUMERIC to C, to match old pw_init behavior.
This also improves the status output to display the configured default node
names using the new get-default-configured-node-name API, and refactors
set-default to also use the new set-default-configured-node-name API from
the default-nodes-api module.
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
