These can be set on the font directly, but had not been added to
QTextCharFormat, so there would be no way to override them by
formatting in a rich text document.
Fixes: QTBUG-134060
Change-Id: I4494e24cb9b99d84fb376ba895e2461fc3cd054b
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>