Deprecate the qWaitForWindowShown(QWindow *) method.

Deprecate the qWaitForWindowShown(QWindow *) method.

While the qWaitForWindowShown(QWidget *) is inherited
from Qt 4.8, the qWaitForWindowShown(QWindow *) was introduced
in Qt 5. As it is identical to qWaitForWindowExposed()
and removed already, it can be deprecated in Qt 5.

Remove its usages in qtbase.

Change-Id: I28788d120ad687a49f02b2b44de6b38a2832fe5c
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>
Reviewed-by: Jason McDonald <jason.mcdonald@nokia.com>