Add a config setting for storing application settings

Summary:
I'm just going to store application policy settings (like view/edit policy, and default policies for content) in config, because:

  1) We'll need access to it on every page, and Config is "free" since we already pull it.
  2) Building separate storage and transactions seems like overkill, we get less-nice but pretty-reasonable transactions for free with config.
  3) We could easily move it later if this is a bad call.

Also fix some formatting.

Test Plan: See future revisions.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D7202

src/applications/config/editor/PhabricatorConfigEditor.php

@@ -105,7 +105,10 @@ final class PhabricatorConfigEditor
   }
 
   public static function storeNewValue(
-   PhabricatorConfigEntry $config_entry, $value, AphrontRequest $request) {
+    PhabricatorConfigEntry $config_entry,
+    $value,
+    AphrontRequest $request) {
+
     $xaction = id(new PhabricatorConfigTransaction())
       ->setTransactionType(PhabricatorConfigTransaction::TYPE_EDIT)
       ->setNewValue(

src/applications/config/option/PhabricatorCoreConfigOptions.php

@@ -175,6 +175,10 @@ final class PhabricatorCoreConfigOptions
         ->setLocked(true)
         ->setDescription(
           pht('Array containing list of Uninstalled applications.')),
+      $this->newOption('phabricator.application-settings', 'wild', array())
+        ->setLocked(true)
+        ->setDescription(
+          pht('Customized settings for Phabricator applications.')),
       $this->newOption('welcome.html', 'string', null)
         ->setLocked(true)
         ->setDescription(