Moderize Pholio UI

Summary: Cleans up Pholio, moves to two column layout, fix some transaction inconsistencies. This moves "Image" to the MainColumn, which feels fine, but I think we'll likely want some sort of "fullscreen" option for Pholio V2 like we have on workboards perhaps.

Test Plan:
New Mock, Edit Mock, View Mock.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D15564