refactor code to use getHandler function

...ttributeAndOperation/AttributeOperationCommonPattern.java

....iorm.ui/core/attributeAndOperation/AttributePattern.java

....iorm.ui/core/attributeAndOperation/OperationPattern.java

...amed.iorm.ui/core/fulfillment/EditFulfillmentFeature.java

org.framed.iorm.ui/core/fulfillment/FulfillmentPattern.java

org.framed.iorm.ui/core/fulfillment/ResetLayout.java

org.framed.iorm.ui/core/group/GroupPattern.java

org.framed.iorm.ui/core/inheritance/InheritancePattern.java

org.framed.iorm.ui/core/model/ModelPattern.java

org.framed.iorm.ui/core/naturaltype/NaturalTypePattern.java

org.framed.iorm.ui/core/roletype/RoleTypePattern.java

...d.iorm.ui/modules/compartment/CompartmentTypePattern.java

org.framed.iorm.ui/modules/datatype/DataTypePattern.java

...nstraints/AbstractInterRelationshipConstraintPattern.java

...nstraints/AbstractIntraRelationshipConstraintPattern.java

...med.iorm.ui/modules/relationship/RelationshipPattern.java

...odules/roleconstraints/AbstractRoleConstraintPattern.java

.../src/org/framed/iorm/ui/editPolicy/EditPolicyHandler.java