Allows a button type for menus, used in Conpherence

Summary: This adds a new menu item, TYPEBUTTON, for use in Conpherence and maybe others over time. Note I need to add icon support, but I'll make them later tonight. I also changed the front facing names to 'Conversations' which is way more natural. Basically, Pholio has Mocks, Differential has Diffs, Conpherence has Conversations.

Test Plan: Tested Conpherence on mobile and desktop.

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T2430

Differential Revision: https://secure.phabricator.com/D4691

src/applications/conpherence/controller/ConpherenceController.php

@@ -107,9 +107,9 @@ abstract class ConpherenceController extends PhabricatorController {
     $nav->addClass('conpherence-menu');
     $nav->setMenuID('conpherence-menu');
 
-    $nav->addFilter(
+    $nav->addButton(
       'new',
-      pht('New Conpherence'),
+      pht('New Conversation'),
       $this->getApplicationURI('new/')
     );
     $nav->addLabel(pht('Unread'));
@@ -171,7 +171,7 @@ abstract class ConpherenceController extends PhabricatorController {
       array(
         'class' => 'no-conpherences-menu-item'
       ),
-      pht('No more conpherences.')
+      pht('No more conversations.')
     );
   }
 
@@ -185,7 +185,7 @@ abstract class ConpherenceController extends PhabricatorController {
     $crumbs
       ->addAction(
         id(new PhabricatorMenuItemView())
-          ->setName(pht('New Conpherence'))
+          ->setName(pht('New Conversation'))
           ->setHref($this->getApplicationURI('new/'))
           ->setIcon('create')
       )