Simplify PHUIObjectItemList a bit

Summary: I don't think we use footicons, removing that CSS. States were added but only used in Auth, convert them to statusIcon instead.

Test Plan: Visit Auth, UIExamples, grep for setState

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D16418