by passing PrimitiveContainer&& around.
There are lots of place where we were preparing a local variable of type
PrimitiveContainer, and then copying it someplace else, then throwing it
away.
Change-Id: Iacfd983640c9e55da25800ccc01734dfc8b4d64a
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/122527
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
