remove default-able copy-ctors/assignments

Change-Id: I40255393899275a5825ffef4df3f08c6ce5348c2
Reviewed-on: https://gerrit.libreoffice.org/47140Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>