- add ChangeDateAndTimeWindow,
- extract EventTimeItem to common widgets folder
and rename it to TimeWidget,
- extract EventDateItem to common widgets folder
and rename it to DateWidget,
- replace timeWidget with common TimeWidget
in NightshiftWindow,
- refactor time setting in
DesktopMainWindow and TopBar,
- Remove dead code from EventManager
(GetNextAlarmTimestamp and HandleAlarmTrigger)