Deprecated the SAX classes and disabled or replaced their uses in
tests if applicable.
Removed the saxbookmarks example, no point in keeping examples for
the deprecated code.
[ChangeLog][QtXml] SAX classes are now deprecated. Use QXmlStreamReader,
QXmlStreamWriter in QtCore instead.
Task-number: QTBUG-76177
Change-Id: Ic171d62fa0527b0f36f94cf09a69586092269957
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
Reviewed-by: Kai Koehne <kai.koehne@qt.io>
82d02b7b95