Implement the event of edit icon.
Merge branch 'EventClass' of https://github.com/Coffeinism/Reminder.git
GUI adjusted.
Merge branch 'EventClass' of https://github.com/Coffeinism/Reminder.git

Conflicts:
	Event.cs
Merge branch 'EventClass' of https://github.com/Coffeinism/Reminder.git

Conflicts:
	Event.cs
	MainFormComponent.cs
Merge branch 'master' of https://github.com/StanleyDing/Reminder into StanleyDing-master

Conflicts:
	MainFormComponent.cs