R1:885e775f007d

Add font-awesome-ish project icons

Summary: Adding a set of 16 icons that match the typeahead icons.

Test Plan: review in photoshop

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T6856

Differential Revision: https://secure.phabricator.com/D11183