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
Let feed panels render something meaningful-ish

Summary:
Ref T4986. We need to introduce alternate views to make this more pleasant, but let rendering move to engines so it can be shared between panels and controllers.

I also moved some of the pagination logic in to avoid duplicating that.

So far, only Feed works. I'm going to do these gradually since we have ~40-50 of them.

Test Plan:
  - Used global search to check for collateral damage.
  - Used not-global search too.
  - Used normal feed.

{F151541}

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: chad, epriestley

Maniphest Tasks: T4986

Differential Revision: https://secure.phabricator.com/D9008
Move Slowvote rendering into SearchEngine

Summary:
Ref T4986. This adds a bit of structure for handles, since we used to have Controller utilities but no longer do.

Hopefully these will start going faster soon...

Test Plan:

  - Checked feed for collateral damage.
  - Checked slowvote for collateral damage.
  - Made a slowvote panel.

{F151550}

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T4986

Differential Revision: https://secure.phabricator.com/D9010
Move audit rendering into SearchEngine

Summary:
Ref T4986. Updates audit.

Slightly tweaks on method visibility.

Just used a HandleQuery since we have to rebuild the whole view thing otherwise; this is an unusual case.

Test Plan:
  - Checked Audit.
  - Checked Feed.
  - Checked Slowvote.

{F151555}

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T4986

Differential Revision: https://secure.phabricator.com/D9011
Move rendering to SearchEngine for Calendar

Summary:
Ref T4986. This one needs `getApplicationURI()` so make it a little beefier to deal with that.

(It would be vaguely nice to somehow share the handle and application stuff between Controllers and Engine classes like this, but I don't immediately see a clean way to do it without traits. Not a big deal, in any case.)

Test Plan:
  - Viewed Calendar.
  - Made a Calendar panel.
  - Viewed feed.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T4986

Differential Revision: https://secure.phabricator.com/D9012
Move Conduit rendering to SearchEngine

Summary: Ref T4986. Nothing special.

Test Plan: Looked at Conduit, made a panel.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T4986

Differential Revision: https://secure.phabricator.com/D9013
Move Countdown rendering to SearchEngine

Summary: Ref T4986.

Test Plan: Viewed app, made a panel.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T4986

Differential Revision: https://secure.phabricator.com/D9014
Move dashboard list rendering to ApplicationSearch

Summary: Ref T4986. This is "good" and "desirable".

Test Plan: Saw dashboard list, panel.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T4986

Differential Revision: https://secure.phabricator.com/D9015
Move a bunch more rendering into SearchEngine

Summary: Ref T4986. These are mostly mechanical now, I skipped a couple of slightly tricky ones. Still a bunch to go.

Test Plan:
For each engine:

  - Viewed the application;
  - created a panel to issue the query.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T4986

Differential Revision: https://secure.phabricator.com/D9017