Update Phrequent to use new search infrastructure.

Summary:
This updates Phrequent to use new the search infrastructure. Now it looks like:

{F60141}

I've also added the policy infrastructure stubs, but it's probably not even close to being right in terms of enforcing policies (in particular being able to see time tracked against objects the user wouldn't normally be able to see).

At some point I'd like to be able to filter on the objects that the time is tracked against, but I don't believe there's a tokenizer / readahead control that allows you to type any kind of object.

Test Plan: Clicked around the new interface, created some custom queries and saved them.

Reviewers: epriestley

CC: Korvin, aran

Maniphest Tasks: T3870

Differential Revision: https://secure.phabricator.com/D7163