ImageSource Marker series

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Summary

After reviewing the effort to make MarkerSeries handle different types of FrameworkElement for markers, it is decided to implement a separate series type.

Actual Behavior

Not available.

Expected Behavior

Have a marker series type with the marker tied to an ImageSource instead of Geometry. Internally, the component uses the Image element with an appropriate VM shim.

Additional Details

The main difficulty lies in properly recycling UI elements, which is complicated if they are not all the same class.

Also ties into legends. The IChartTheme must be extended to provide the default Image used.