Summary:
Ref T8183. See that task for discussion.
- For now, events always mark users as "Away".
- In the future, we may reintroduce "sporradic" or other more complicated availability states, but they would be properties of the invitee, not of the event itself.
- This also removes the long-deprecated `user.addstatus` and `user.removestatus` Conduit calls.
Test Plan:
- Created, edited, viewed events.
- Grepped for removed symbols.
- Viewed profile calendar.
- Viewed Conpherence calendar.
- Load Conduit console.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T8183
Differential Revision: https://secure.phabricator.com/D12840
