Support import, storage, and export of OOXML chart color styles
(color sequence). In OOXML, chart color styles are in files such
as colors1.xml, and conform to the chartStyle schema. This commit
supports I/O of color styles, and provides supports storing them
in the chart document model. It does not include any features for
using or modifying the color styles, so at this point it has no
appreciable effect on users.
Change-Id: I5c02137ebf9c25e11951eea55c4c77fda35b0e80
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/194998
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
Kurt Nordback
0686b19728