fix(scatterplot) support multiple legends#2016

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tkonopka wants to merge 3 commits intoplouc:masterfrom tkonopka:fix-scatterplot-multiple-legends

+517-91

Commits on May 25, 2022

fixed support for multiple legends in scatterplot
tkonopka
committed
simplified data structure with legend items, support for arbitrary new items in legend
tkonopka
committed

Commits on May 26, 2022

simplified legend-generation code; rearranged node compute to reduce memory use
tkonopka
committed