Provide convenience method addTextCrumb() to PhabricatorCrumbsView

Summary: We currently have a lot of calls to `addCrumb(id(new PhabricatorCrumbView())->...)` which can be expressed much more simply with a convenience method. Nearly all crumbs are only textual.

Test Plan:
  - This was mostly automated, then I cleaned up a few unusual sites manually.
  - Bunch of grep / randomly clicking around.

Reviewers: btrahan, chad

Reviewed By: btrahan

CC: hach-que, aran

Differential Revision: https://secure.phabricator.com/D7787

src/applications/diffusion/controller/DiffusionRepositoryEditEncodingController.php

@@ -57,9 +57,7 @@ final class DiffusionRepositoryEditEncodingController
     }
 
     $crumbs = $this->buildApplicationCrumbs();
-    $crumbs->addCrumb(
-      id(new PhabricatorCrumbView())
-        ->setName(pht('Edit Encoding')));
+    $crumbs->addTextCrumb(pht('Edit Encoding'));
 
     $title = pht('Edit %s', $repository->getName());