Rough skeleton of a "Query" dashboard panel
Summary: Ref T4986. This isn't pretty/usable yet (I need to move rendering out of ListController classes and into SearchEngine classes, I think) but does pull the correct results.
Test Plan: {F151537}
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T4986
Differential Revision: https://secure.phabricator.com/D9007