Refactor sunburst

[vincerubinetti]

• match svg font size to document font size
• refactor using d3 util funcs, significantly reducing LOC and complexity. much less custom math, no more recursion (because d3 tree structure gives nice methods to access what we need), more flexible
• use different method for vertical centering of text (thanks to safari not supporting dominant-baseline with text-path)
• update testbed to show more children slices, and sometimes have only 1 root slice (testing full circle, which is edge case with SVG arc commands)
• update viewbox fit util func to return individual numbers
• write generalized hook to adapt font size (or any other size) in an svg to the size of something in the document

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