Sets an explicit fill hatch, or creates a named fill hatch
and stored in a global container. With this patch the
SUPPORTED MS Office hatch styles by LibreOffice, or the custom
LibreOffice hatches will be appeared correctly instead of the
previous display as horizontal lines in LibreOffice.
(The background color of the hatch styles are not imported correcty,
but that is another BUG.)

Change-Id: Ifda9dc805dd08f58db10b35f40d7f511a8614f77
Reviewed-on: https://gerrit.libreoffice.org/62681
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>