Update Settings for WHITE_CONFIG style boxes

Summary: Updates settings panel UI for new white box, cleans up other various UI nitpicks.

Test Plan: Click through each setting that had a local setting page. Edit Engine pages will follow up on another diff.

Reviewers: epriestley

Reviewed By: epriestley

Spies: Korvin

Differential Revision: https://secure.phabricator.com/D18526