Upgrade TR46 tables from Unicode 11 to Unicode 13.
Fix build errors related to
makeinfo, this would manifest itself by looking for
idn2-help.texi instead. Further, some BSD grep implementations did not like the
\+ regexp command, so we now rely on the (apparently) more portable
* regexp command.
doc: Improve GTK-DOC manual.
doc: Don't ship HTML/PDF manual, drop custom CSS stylesheet.
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