and expose a new cppcanvas::tools::createTextLinesPolyPolygon
interace to fetch them in order to fill each of them with their
own color later.

Change-Id: I26e99a9af87a69d9cb71cda6a4c03c4ba42158dc
Reviewed-on: https://gerrit.libreoffice.org/62830
Tested-by: Jenkins
Reviewed-by: Mark Hung <marklh9@gmail.com>