R1:97b866ee1f47

New icons

Summary: Removed shadow from white icons, made some new ones for maniphest, cleaned up a few old ones.

Test Plan: uiexamples, photoshop

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: Korvin, aran

Differential Revision: https://secure.phabricator.com/D7106