all the old behaviour of invisible objects to the new directed links + other small fixes
Fixed config issues in WebServer
Fixed an error, where object handling crashed when objects had connections to nonexisting objects
Cleanup room code
Merge branch 'develop' into feature/ResponsivePositioning

* develop:
  Cleanup room code
  Fixed an error, where object handling crashed when objects had connections to nonexisting objects
  Fixed config issues in WebServer
  all the old behaviour of invisible objects to the new directed links + other small fixes