* Added timer component
* Reworked functionality a bit
* Fixed requested change
* Fixed state updates when finished
* Removing expired listeners, added events, changed services
* Added finish service
* Using timedelta parameters in start-service
* Cleanup
* Lint
* Updating state for remaining time
* Removed duration from cancel method
* Renamed service to fix disabled lint
* Some tests (incomplete)
* Relocated service descriptions
* Addressed requested changes
* Adjusted tests, added methods and events
* Added test for finish service, lint
* Code cleanp, using string states
* tzzz... one char...
* Proper usage of restore_state
* Some more cleanup
Fabian Affolter
Pascal Vizeli
Daniel Perna