#79 improved peerfeedback interface implementation

#77 create Table for Peer2PeerFeedback
#78 db communication (create new entry)
#79 implement createPeer2PeerFeedback
#80 adjust view for student (givefeedback)

feat: docent quiz page

feat: started to implement cheat resisting workRating

feat: workRating for peers are written to DB
feat: 2 new tables in DB

feat: creating Quizzes in the DB possible

It is necessary to hide the button if the comment text is to long