n#870234: Import gradfill for text colors.

Uses the first color from the gradfill list.
(Which is better than plain black!)

(cherry picked from commit cfc76de83e3c0a56abd30a8f3bd7c69d3500d223)
Signed-off-by: Andras Timar <andras.timar@collabora.com>

Conflicts:
	oox/source/drawingml/textcharacterproperties.cxx
	oox/source/drawingml/textcharacterpropertiescontext.cxx

Change-Id: I4c1c0c4b031f3681c95b75b3c0683eb4de95bffb