Merge branch 'feature/observerview' into develop

...otionstudio/gef/editor/command/BringToTopStepCommand.java

...nstudio/gef/editor/internal/VisualizationProgressBar.java

...ditor/src/de/bmotionstudio/gef/editor/model/BControl.java

...ionstudio/gef/editor/model/BControlPropertyConstants.java

...nstudio/gef/editor/model/ObserverRootVirtualTreeNode.java

.../src/de/bmotionstudio/gef/editor/model/Visualization.java

.../de/bmotionstudio/gef/editor/observer/ColumnObserver.java

...ionstudio/gef/editor/observer/ExternalObserverScript.java

...tudio/gef/editor/observer/ListenOperationByPredicate.java

...or/src/de/bmotionstudio/gef/editor/observer/Observer.java

...bmotionstudio/gef/editor/observer/ObserverEvalObject.java

.../de/bmotionstudio/gef/editor/observer/ObserverWizard.java

...rc/de/bmotionstudio/gef/editor/observer/SetAttribute.java

...bmotionstudio/gef/editor/observer/SetAttributeObject.java

...bmotionstudio/gef/editor/observer/SimpleValueDisplay.java

...ionstudio/gef/editor/observer/SwitchChildCoordinates.java

.../bmotionstudio/gef/editor/observer/SwitchCoordinates.java

...src/de/bmotionstudio/gef/editor/observer/SwitchImage.java

...c/de/bmotionstudio/gef/editor/observer/TableObserver.java

...onstudio/gef/editor/observer/ToggleObjectCoordinates.java