move what we still need into color.hxx

Change-Id: Ied7e31eb16468aa334c666b1499a6262f16a6350
Reviewed-on: https://gerrit.libreoffice.org/50561Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>