Build a page for viewing all inline comments

Summary: Adds a very basic list of all inline comments, threaded, and their status. Kept this a little simpler than the mock, mostly because sorting here feels a little strange given threads would be all over the place. Not sure sorted is needed in practice anyways. I'd probably lean towards just adding a JS checkbox to hide certain rows if needed in the future.

Test Plan:
Test various commenting structures:

 - Leave Comment
 - Update Diff
 - Leave new comment
 - Reply to comment
 - Reply to comment as revision author
 - Mark items as done
 - Update diff again

{F4996915}

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D18112

src/applications/differential/controller/DifferentialRevisionViewController.php

@@ -574,6 +574,12 @@ final class DifferentialRevisionViewController extends DifferentialController {
         ->setDisabled(!$can_edit)
         ->setWorkflow(!$can_edit));
 
+    $curtain->addAction(
+      id(new PhabricatorActionView())
+        ->setIcon('fa-indent')
+        ->setHref("/differential/revision/inlines/{$revision_id}/")
+        ->setName(pht('List Inline Comments')));
+
     $curtain->addAction(
       id(new PhabricatorActionView())
         ->setIcon('fa-upload')