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Improve performance of XML writers.

Allison Vacanti requested to merge allisonvacanti/vtk:xml_writer_speed_fix into master

The SVG exporter uses the VTK XML writers, and part of the SVG spec is that images end up encoded in an attribute using base 64.

Writing out modest (~1024x512) images was taking several minutes. Fixed the issue identified here, and now the write is more or less instantaneous.

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