feat: calculate Assessment on basis of DB.

...c/main/java/unipotsdam/gf/interfaces/IPeerAssessment.java

...am/gf/modules/assessment/controller/model/Categories.java

...m/gf/modules/assessment/controller/model/Performance.java

...ules/assessment/controller/model/cheatCheckerMethods.java

...essment/controller/service/AssessmentDBCommunication.java

.../modules/assessment/controller/service/FBAssessement.java

...modules/assessment/controller/service/PeerAssessment.java

...es/assessment/controller/service/PeerAssessmentDummy.java

...es/assessment/controller/service/QuizDBCommunication.java

...tsdam/gf/modules/assessment/controller/view/QuizView.java

...ava/unipotsdam/gf/modules/peerassessment/HashMapTest.java