VegaLite.jl
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Add option for DPI setting when exporting to PNG
Blocked by https://github.com/vega/vega/issues/2269, at least for the scenario where we use the node stack to create the PNGs. We could implement this for the version that uses Cairo.jl/Rsvg.jl right now, but I think we should probably just wait until we can do this properly in both scenarios.