Convert rest of SPRITE_STATUS to FontAwesome

Summary:
Updates policy, headers, typeaheads to FA over policy icons

Need advice - can't seem to place where icons come from on Typeahead? Wrong icons and wrong colors.... it is late

Test Plan:
- grepped for SPRITE_STATUS
- grepped for sprite-status
- grepped for setStatus for headers
- grepped individual icons names

Browsed numerous places, checked new dropdowns, see pudgy people.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin

Maniphest Tasks: T4739

Differential Revision: https://secure.phabricator.com/D9179