Remove Controller->getHandle() and Controller->loadHandles()

Summary: Ref T7689. Modernize all callsites of these methods.

Test Plan:
- Poked at dashboards.
  - Pretty sure this code is technically unreachable right now.
- Viewed commit; viewed "Audit Status".
- Viewed a fund; viewed "Payable to"; viewed "Owner".
- Viewed herald rules; viewed "Author"; viewed "Applies To".
- Viewed a Legalpad document; viewed "Contributors".
- Viewed Phame post list; viewed blog; viewed post (viewed "Blog", viewed "Blogger").
- Viewed a macro; viewed "Audio".
- Viewed a Phriction page; viewed "Last Author".
- Viewed a Ponder question; viewed "Author".
- Viewed a Ponder answer; viewed header.
  - Behavior changed very slightly here; whatevs.
- Viewed a Countdown; viewed "Author".

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T7689

Differential Revision: https://secure.phabricator.com/D12210

src/applications/fund/controller/FundInitiativeViewController.php

@@ -87,19 +87,14 @@ final class FundInitiativeViewController
 
     $owner_phid = $initiative->getOwnerPHID();
     $merchant_phid = $initiative->getMerchantPHID();
-    $this->loadHandles(
-      array(
-        $owner_phid,
-        $merchant_phid,
-      ));
 
     $view->addProperty(
       pht('Owner'),
-      $this->getHandle($owner_phid)->renderLink());
+      $viewer->renderHandle($owner_phid));
 
     $view->addProperty(
       pht('Payable to Merchant'),
-      $this->getHandle($merchant_phid)->renderLink());
+      $viewer->renderHandle($merchant_phid));
 
     $view->addProperty(
       pht('Total Funding'),