LibreOffice recognizes MS Office Table Of Contents, but LO files
saved as .doc didn't show the Cross-Refence heading - it was blank.
Now bookmarks using the LO naming convention are also imported
as TOC bookmarks from .doc files.

Testcase included.

Change-Id: Icae5c0de31856ccc75ede9a97c0ea046dd97325f
Reviewed-on: https://gerrit.libreoffice.org/14018Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>