Use ApplicationSearch in projects

Summary: Ref T2715. I stripped a bunch of stuff from the list since it was buggy, slow, or both. Some day, we'll rebuild it.

Test Plan: {F51128}

Reviewers: btrahan, chad

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2715

Differential Revision: https://secure.phabricator.com/D6525