R1:ef90c7ed2c3e

Fix padding issues on Phriction History

Summary: Cleans up the UI a bit, removes excess spacing on ObjectList and adds space around history buttons.

Test Plan: Test a few changes in Phriction. Click on buttons.

Reviewers: epriestley, btrahan

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11904