Now, the configuration is made into a proper Nix configuration with the
output being converted to INI format.
For mapping the types, look for `mopidy/config/types.py`. The only
quirky mapping so far is the list type.
It is just an adapted version from the NixOS module. I'll eventually
figure out how to be 'properly configured' with the Nix language through
the `lib.generator`.
