Wrap all comments to 100 characters. Add a lint for long comments. #4263
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Also configures
rustfmtto 100 charactermax_width, which only impacts code reflows, and isn't a hard limit. But here in this change, I'm only worried about comments.Fix #4262
NOTE: This will conflict all over the place with #4219, which I totally know and understand, but most of it won't, and I am gonna rebase it afterward. But I just had a little more steam left tonight and wanted to bang this out.