The strings holding the names used for libraries have also been
moved to different variables. This way they would be less error
as these variables can be reused easily and any typing error
would be quickly detected.
These files are a template how to add a new nm-setting-* implementation.
We are not going to add new files to the deprecated libnm-util library,
hence a template for libnm-util is pointless.
libnm-core doesn't have a corresponding template file. Personally, I
don't think such a template are a great idea either, because
- People are not aware that it exists. Hence, it's unused, badly
maintained and quite possibly does not follow current best practice.
- Just copy an actual settings implementation and start from there.
That seems better to me than having a template.
