Add new overloads to OUString methods that have a
"OUString* rest" style parameter.
Instead return a view, which does not require allocation.
To avoid overload ambiguity, split the methods into
different variants that do not use default parameters.
Change-Id: I1aa366115750f1f7ea4fe665804195f59f7c4b69
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/167632
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Jenkins
