Add basic error handling on timeline load timeout (WIP)


TODO:
- Share timeline states in a service
- hide toolbar when there is an error
Hide all timeline elements if an errorMessage is displayed
Fix typos
Inject timeline model in timeline container directive (WIP)


TODO: Remove Timeline from window context, refactor dependencies
Merge pull request #1247 from opf/fix/timeline-timeout-error-handling-7286

Add basic error handling on timeline load timeout