[write-fonts] Graphviz improvements #612
Merged
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This adds the ability to set an env var ('FONTC_PRUNE_GRAPH') that tells write-fonts to prune a generated dotviz file to only include spaces that contain an overflow. This was very helpful for debugging our PairPos format 2 packing failures.
It also cleanups up our graphviz code to not use subgraphs, which weren't adding much if anything.