refactoring: switching to dependency injection and fixing tests

...c/main/java/unipotsdam/gf/modules/project/ProjectDAO.java

...orschen/src/main/webapp/annotation/js/annotationScript.js

...n/src/main/webapp/annotation/js/unstructuredAnnotation.js

...schen/src/main/webapp/annotation/js/unstructuredUpload.js

...hen/src/main/webapp/assessment/js/assessmentCalculator.js

...orschen/src/main/webapp/assessment/js/rateContribution.js

...forschen/src/main/webapp/course/js/specificRequirement.js

...insamforschen/src/main/webapp/course/js/specificSkills.js

...c/main/webapp/groupfinding/create-groups-learninggoal.jsp

...amforschen/src/main/webapp/groupfinding/create-groups.jsp

...main/webapp/groupfinding/js/create-groups-learninggoal.js

...nsamforschen/src/main/webapp/project/js/create-project.js

...orschen/src/main/webapp/project/js/edit-group-settings.js

...samforschen/src/main/webapp/project/js/overview-docent.js

...amforschen/src/main/webapp/project/js/overview-student.js

gemeinsamforschen/src/main/webapp/project/js/overview.js

...samforschen/src/main/webapp/project/js/project-student.js

gemeinsamforschen/src/main/webapp/project/js/showProjects.js

...insamforschen/src/main/webapp/project/overview-docent.jsp

gemeinsamforschen/src/main/webapp/project/project-docent.jsp