Added stepper for changing duration and fixed timer problem.
Save updated Stillen event. Modified table view cell in master view controller.
Fixed display of incorrect time.
Use BPCategory enum
Korrektur der Anzeige der Dauer bei Stillen Events.
Show duration as text in a circle.
Fix problem with updating the duration.
Remove unused BPDetailViewController.
Removed unnecessary comments.
Add layout constraints for clock.