- Since MaterialUI does not have an equivalent to bootstrap alterts,
the toast service and alert service are marked as deprecated for now.
The functionality has been replaced with the snackbar.
- AuthenticationService->AuthService
- removed underscore-directories
- put site related stuff into site/
- same for projector
- auth service went into a core/ directory, used by site and projector
- the alert is now not global anymore. Every view can have its own alert
- make the auth service query users/whoami for the current user
- made a new OpenSlides service for managing the startup
... A lot todo ...
