enhancement: footer build as taglib, closed #74, closed #71, closed #70, closed #75

...rc/main/java/unipotsdam/gf/core/management/user/Menu.java

.../main/java/unipotsdam/gf/core/management/user/footer.java

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

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

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

...nsamforschen/src/main/webapp/assets/js/finalAssessment.js

...samforschen/src/main/webapp/assets/js/rateContribution.js

gemeinsamforschen/src/main/webapp/assets/js/utility.js

...forschen/src/main/webapp/core/pages/gemeinsamForschen.tld

gemeinsamforschen/src/main/webapp/pages/Quiz-docent.jsp

gemeinsamforschen/src/main/webapp/pages/Quiz.jsp

gemeinsamforschen/src/main/webapp/pages/changePhase.jsp

gemeinsamforschen/src/main/webapp/pages/createGroups.jsp

gemeinsamforschen/src/main/webapp/pages/createProject.jsp

gemeinsamforschen/src/main/webapp/pages/createQuiz.jsp

gemeinsamforschen/src/main/webapp/pages/finalAssessments.jsp

gemeinsamforschen/src/main/webapp/pages/profile.jsp

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

gemeinsamforschen/src/main/webapp/pages/project-student.jsp

gemeinsamforschen/src/main/webapp/pages/rateContribution.jsp