Rename PhabricatorApplication subclasses

Summary: Ref T5655. Some discussion in D9839. Generally speaking, `Phabricator{$name}Application` is clearer than `PhabricatorApplication{$name}`.

Test Plan:
# Pinned and uninstalled some applications.
# Applied patch and performed migrations.
# Verified that the pinned applications were still pinned and that the uninstalled applications were still uninstalled.
# Performed a sanity check on the database contents.

Reviewers: btrahan, epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: hach-que, epriestley, Korvin

Maniphest Tasks: T5655

Differential Revision: https://secure.phabricator.com/D9982

src/applications/support/application/PhabricatorSupportApplication.php

@@ -0,0 +1,21 @@
+<?php
+
+final class PhabricatorSupportApplication extends PhabricatorApplication {
+
+  public function canUninstall() {
+    return false;
+  }
+
+  public function isUnlisted() {
+    return true;
+  }
+
+  public function getRoutes() {
+    return array(
+      '/help/' => array(
+        'keyboardshortcut/' => 'PhabricatorHelpKeyboardShortcutController',
+      ),
+    );
+  }
+
+}