Fix include order to respect the Coding Conventions. Add needed includes to avoid Transitive includes. Remove uneeded classes. Remove QT_{BEGIN,END}_NAMESPACE because these are private Qt macros that should not be used in the examples. Task-number: QTBUG-117064 Pick-to: 6.5 Change-Id: Ie98d4fbddb18d5578e2651bdb4850527ff984582 Reviewed-by: Ivan Solovev <ivan.solovev@qt.io> (cherry picked from commit f77c7e1bf54288bd6720e8a41b7ac9a0486c93d5) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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