RFC 9074 - Alarm Extension

[niccokunzmann]

RFC 9074 extends what the VALARM component can do.

Add the following to the VALARM:

• [ ] UID
• [ ] RELATED-TO
• [ ] ACKNOWLEDGED: DATE-TIME
• [ ] "SNOOZE" relationship type for use with the "RELTYPE" - 7.1. Relationship Type Property Parameter
• [ ] PROXIMITY MAX ONCE
  • [ ] "ARRIVE" / "DEPART" / "CONNECT" / "DISCONNECT"

See also:

• https://www.rfc-editor.org/rfc/rfc9074.html
• https://github.com/collective/icalendar/issues/589