some places are marked with "dodgy"- need to check those to see
what is going on, because they are leaving dangling pointers behind
in the Menu class

Change-Id: I41d5c7c0fec2f70ce9e3ffdc48cd03d26c0a869b
Reviewed-on: https://gerrit.libreoffice.org/26516Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>