[ADD] Various changes for the EEG View module and CustomDockWidgets:
* EEG View module is properly connected to EEG-Input and properties are handled (currenty only the "active"-property). * createCustomWidget stops to wait also on module-shutdown. * createCustomWidget returns created widget. * WQtCustomDockWidget sets its scene to a blank group node and offers a get-method for it. * There's no problem to try to create an already existing CustomWidget. The old one is returned and can be used. * Added getCustomDockWidget() method to WMainWindow. * Improved getViewerByName() method in WGraphicsEngine.
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