Remove unused packages that seem to be old ProB 2 code

de.prob.core/META-INF/MANIFEST.MF

...e/src/de/prob/animator/domainobjects/EvalElementType.java

.../src/de/prob/animator/domainobjects/EvaluationResult.java

de.prob.core/src/de/prob/animator/domainobjects/EventB.java

...core/src/de/prob/animator/domainobjects/IEvalElement.java

de.prob.core/src/de/prob/model/eventb/Context.java

de.prob.core/src/de/prob/model/eventb/Event.java

de.prob.core/src/de/prob/model/eventb/EventBAction.java

de.prob.core/src/de/prob/model/eventb/EventBAxiom.java

de.prob.core/src/de/prob/model/eventb/EventBConstant.java

de.prob.core/src/de/prob/model/eventb/EventBGuard.java

de.prob.core/src/de/prob/model/eventb/EventBInvariant.java

de.prob.core/src/de/prob/model/eventb/EventBMachine.java

de.prob.core/src/de/prob/model/eventb/EventBVariable.java

de.prob.core/src/de/prob/model/eventb/EventParameter.java

de.prob.core/src/de/prob/model/eventb/Variant.java

de.prob.core/src/de/prob/model/eventb/Witness.java

...ore/src/de/prob/model/representation/AbstractElement.java

de.prob.core/src/de/prob/model/representation/Action.java

de.prob.core/src/de/prob/model/representation/Axiom.java