This is a first-step towards implementing the legacy parser using
the XFastParser.

Change-Id: I37fc0419dbef1d6f067e45e0b1f2fd6051fb158d
Reviewed-on: https://gerrit.libreoffice.org/24883Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>