Advanced Diagram support: Secure properties at Diagram ModelData

Additionally to the Text/Attributes already saved/secured after
Diagram import, secure more data that is part of the Diagram
ModelData. This is about attributes (e.g. FillStyle/LineStyle,
TextAttributes, ...) in UNO API formt that will be secured/
attached to the Diagram ModelData in it's
svx::diagram::Point structure.
This is done for all those entries for which a XShape will/
would be incarnated, thus associated to entries that will
get a visualization, including the BackgroundObject.
From that data, at re-creation time, the attributes can be
re-applied to the re-created XShape(s), also after changes
to the Diagram Model Data (e.g. Add/Remove).
This is - besides the already added securing of the Style/
Theme - a 2nd method for lossless re-creation. For the
BackgroundObject - if it has FillStyles - it is even the
only method to secure that data and thus necessary for that
case. The selection of atributes that gets secured is minimal
for now and may/need to be extended for existing cases
accordingly.

Change-Id: Ie9b72b9b9135113cf858d57fe6cd8622d736c4a4
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/132976
Tested-by: Jenkins
Reviewed-by: Armin Le Grand <Armin.Le.Grand@me.com>

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