R1:58df1b7d3be2

Add a top level tab navigation option to PHUITwoColumnView

Summary: Builds out a responsive tab bar system for PHUITwoColumnView pages

Test Plan:
Tested at mobile, tablet, and desktop breakpoints

{F5012429}

{F5012430}

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D18148