Because we removed public setters from QTouchEvent and QEventPoint in
4e400369c0 and now it's proposed to give
QEventPoint a d-pointer again, the implementation of QTouchEventSequence
needs to start using QMutableEventPoint: being a friend will no longer
be enough, because the member variables won't be accessible in the future.
But because we have separate test libs for Gui and Widgets, it needs to
be further refactored into two classes.
Change-Id: I0bfc0978fc4187348ac872e1330d95259d557b69
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>