Summary: Ref T603. Give countdowns proper UI-level policy controls, and an application-level default policy. Put policy information in the header.
Test Plan:
- Adjusted default policy.
- Created new countdowns.
- Edited countdowns.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T603
Differential Revision: https://secure.phabricator.com/D7322
