Clean up access to Session

• Remove access to $_SESSION outside of Session class
  • Replace mobile device detection
  • Replace regionId access
  • Replace regions access
  • Replace pulse message buffer
  • Replace session picture cache
  • Replace "Client" access
• Reduce redundant information in Session class (Verified, Role)

• Move hastodoquiz to QuizXhr !3075 (merged)
• extract current user from session (image, user details, ..)
• Extract region/unit management !3400 (merged)
• move PrivacyAcceptStates to legal module
• generate user UserOption Storage !3146 (merged)
• Remove complex fAuthorization !3078 (merged)
• Extract Csrf !3404 (closed)
• extract isMobile
• remove direct session access
• extract Buddy list !2987 (merged)
• Extract online Session link Update (websocket Server) !3421 (merged)