some global loplugin improvements

for some reason we're hitting more template AST nodes now? Anyhow,
updated singlevalfields and unusedenumconstants to cope.

For unusedfields, ignore field access inside Clone() methods, since it's
like a constructor.
Similarly for unusedmethods.

Change-Id: Icb2f76fb2f06ae5df21f9d75312e42a2800befb9
Reviewed-on: https://gerrit.libreoffice.org/45470
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

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