The QmlObserver relies on installing an event handler on the graphicsview
viewport, to get e.g. Mouse events.
QmlObserver on Mac OS X switches the viewport later on to a QGLViewPort, when
QmlObserver has already been set up ... Make QmlObserver aware of this by
listening to the ChildRemoved event that will be signalled in this case.
Task-number: QTCREATORBUG-2892
Reviewed-by: Lasse Holmstedt
Moved qmljsdebugger to a dir under qml/, made qmlobserver compile
without creator dependencies and made it compile with debugging
helpers.
Reviewed-by: hjk
