feat: dummy tagLib integration for chatWindow with service #42

...orschen/src/main/java/unipotsdam/gf/config/Constants.java

...c/main/java/unipotsdam/gf/config/GFApplicationBinder.java

...in/java/unipotsdam/gf/core/management/ManagementImpl.java

...rc/main/java/unipotsdam/gf/interfaces/ICommunication.java

.../java/unipotsdam/gf/modules/communication/ChatWindow.java

...ules/communication/service/CommunicationDummyService.java

...sdam/gf/modules/communication/view/CommunicationView.java

...nsamforschen/src/main/webapp/communication/chatWindow.tld

gemeinsamforschen/src/main/webapp/pages/overview-docent.html

...insamforschen/src/main/webapp/pages/overview-student.html

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