FYI: stripping away some of the chart2 rendering complexity

[Noel Grandin]

Actually I left out a step.

Before I even do that, I am going to switch the code from creating abstract
UNO objects
    e.g. uno::Reference<drawing::XShape>
to creating explicit types
   e.g. rtl::Reference<SvxShapePolyPolygon>

Just to make it obvious what is happening, and easier to fix regressions.
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