Improve restart/stop/resume UI
Ref T1049. Improves the UI:
- Pending commands, like "stopping", are shown separately from the current status.
- Pending commands are shown on the list view.
- Builds can be restarted, stopped and resumed from the list view.
- Add a missing crumb.
Reviewed By: btrahan
Maniphest Tasks: T1049
Differential Revision: https://secure.phabricator.com/D7898