Added a Disable Macros function that can be called in some contexts where Macros are unsuitable

Summary: Semi Fixed T2397

Test Plan: Can disable the meme button on manually toggling the class variable.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T2397

Differential Revision: https://secure.phabricator.com/D4781

src/applications/phame/controller/blog/PhameBlogEditController.php

@@ -122,7 +122,8 @@ final class PhameBlogEditController
         ->setName('description')
         ->setValue($blog->getDescription())
         ->setID('blog-description')
-        ->setUser($user))
+        ->setUser($user)
+        ->setDisableMacros(true))
       ->appendChild(
         id(new AphrontFormPolicyControl())
           ->setUser($user)