Move even more rendering into SearchEngine

Summary: Ref T4986. I think this is the last of the easy ones, there are about 10 not-quite-so-trivial ones left.

Test Plan:

• Viewed app results.
• Created panels.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T4986

Differential Revision: https://secure.phabricator.com/D9025