Show other events when importing event or receiving event invitation

[bedhub]

When receiving a calendar event invitation or when importing a calendar event i want to see my other events on that day so that i can decide if i can attend to that meeting.

AC

• An event banner is shown when an ics file is attached to the mail
• The new event is shown together with surrounding events in the calendar event banner.
• There is the option to add the event to calendar
• For invites there is still the option to declare attendee status