Use property tabs in Files

Summary:
See screenshots. Some simplifications:

• Tabbed and non-tabbed lists are now allowed to be mixed. We just make the non-tabbed lists permanent and put them on the bottom (e.g., image and audio data in Files).
• You can provide a tab name instead of an entire tab object and we'll build an object for you.
• We respect setSelected() on the tab objects now.

Test Plan: See screenshots.

Reviewers: chad, btrahan

Reviewed By: chad

CC: chad, aran

Differential Revision: https://secure.phabricator.com/D7362