Secured webspaces, roles and collections in admin navigation

This PR applies the security to the navigation. However, the security only applies when the user refreshes the application. The check of the security will apply right after saving the new settings, and the user will get a error label, if he accesses non-permitted areas before the refresh.

__Tasks:__

- [ ] test coverage
- [ ] gather feedback for my changes
- [ ] submit changes to the documentation

__Informations:__

| Q             | A
| ------------- | ---
| Tests pass?   | yes
| Fixed tickets | fixes #467 
| BC Breaks     | none
| Doc           | none