Backport json unicode escaping to 2.3 #4368
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As fromTOML supports \u and \U escapes, bring fromJSON on par. As JSON defaults to UTF-8 encoding (every JSON parser must support UTF-8), this change parses the `\u hex hex hex hex` sequence (\u followed by 4 hexadecimal digits) into an UTF-8 representation. Add a test to verify correct parsing, using all escape sequences from json.org.
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Backport of #3305 to the 2.3 branch.