libnm: drop libnm-util/nm-setting-template.[hc]
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.
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