Replace public operators operator==(), operator!=() of
QJsonObject to friend methods comparesEqual().
Use QT_CORE_REMOVED_SINCE and removed_api.cpp to get rid of current
comparison methods and replace them with a friend.
Add friend method comparesEqual(QJsonObject, QJsonValue)
to the QJsonObject class, to support comparison between QJsonObject
and QJsonValue elements, see test-case valueEquals().
Task-number: QTBUG-120300
Change-Id: Ibab0b4b39966205447e31c41e94e7e1a4e31e553
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
25652c2819