This replaces pAccessible/xAccesible with a rtl::Reference<<SmEditAccessible>.

Change-Id: I7d00acd75fc9598cb7a5ad57357de36877275ad6
Reviewed-on: https://gerrit.libreoffice.org/15987Tested-by: Jenkins <ci@libreoffice.org>
Tested-by: David Tardon <dtardon@redhat.com>
Reviewed-by: David Tardon <dtardon@redhat.com>