Move FontIcon calls to Icon

Summary: Normalizes all `setFontIcon` calls to `setIcon`.

Test Plan: UIExamples, Almanac, Apps list, etc.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, hach-que, yelirekim

Differential Revision: https://secure.phabricator.com/D15129

src/applications/files/query/PhabricatorFileSearchEngine.php

@@ -185,7 +185,7 @@ final class PhabricatorFileSearchEngine
       ->setHref('/file/upload/')
       ->setColor(PHUIButtonView::GREEN);
 
-    $icon = $this->getApplication()->getFontIcon();
+    $icon = $this->getApplication()->getIcon();
     $app_name =  $this->getApplication()->getName();
     $view = id(new PHUIBigInfoView())
       ->setIcon($icon)