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/45470Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>