some refactoring + new observer for executing an external groovy script

de.bmotionstudio.gef.editor/.classpath

de.bmotionstudio.gef.editor/META-INF/MANIFEST.MF

de.bmotionstudio.gef.editor/build.properties

de.bmotionstudio.gef.editor/lib/ext/groovy-all-1.8.6.jar

de.bmotionstudio.gef.editor/plugin.xml

...e/bmotionstudio/gef/editor/AbstractExpressionControl.java

...gef.editor/src/de/bmotionstudio/gef/editor/Animation.java

.../src/de/bmotionstudio/gef/editor/BMotionStudioEditor.java

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

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

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

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

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

...r/src/de/bmotionstudio/gef/editor/observer/IObserver.java

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

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

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

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

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

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