Frontend should disable functionallity that is not availble to the user role

[SchoolGuy]

Is your feature request related to a problem? Please describe.

At the moment the UI assumes that you have complete control over all functionality of Cobbler. This may not be the case in all environments.

Describe the solution you'd like

Functionality that is not available to the user should be displayed but disabled. Hovering over the button should explain why this button is disabled.

Describe alternatives you've considered

None

Additional context

None

[SchoolGuy]

As we have no way to retrieve user rules at the moment, we need to move this to a later release. This should be implemented once the backend offers the needed information.