Update Maniphest "Reports" to base UI

Summary: Replace PanelView with ObjBox. Make burnup chart look less hated.

Test Plan:
Test a project, non project, various layouts on Maniphest Reports

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9397