removed preview feature from observer wizards (buggy)

...f.editor/lib/ext/._antlr-2.7.7.jar1851805142189607825.tmp

...tor/observer/wizard/WizardObserverCSwitchCoordinates.java

...rver/wizard/WizardObserverListenOperationByPredicate.java

...ef/editor/observer/wizard/WizardObserverSetAttribute.java

...itor/observer/wizard/WizardObserverSwitchCoordinates.java

...gef/editor/observer/wizard/WizardObserverSwitchImage.java

...ef/editor/scheduler/ExecuteOperationByPredicateMulti.java