util.stanza: Allow U+7F Allowed by XML despite arguably being a control character. Drops the part of the range meant to rule out octets invalid in UTF-8 (\247 starts a 4-byte sequence), since UTF-8 correctness is validated by util.encodings.utf8.valid().

-- Unknown platform stub
module:set_global();

-- TODO Do things that make sense if we don't know about the platform