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Before 324513b (2012-01-04) std "html" and what is now
"golang.org/x/net/html" were the same. Ever since then (well, since 4e0749a
(2012-05-29)) the escape/unescape code that they share has been drifting
apart, each receiving separate improvements.
This PR cherry-picks over all of the changes that "x/net/html" has seen.
This is the counterpart to https://golang.org/cl/580855.