Clean up browse/history links in Diffusion

Summary:
Fixes T9126. In particular:

  - Add "Browse" links to all history views.
  - Use icons to show "Browse" and "History" links, instead of text.
  - Use FontAwesome.
  - Generally standardize handling of these elements.

This might need a little design attention, but I think it's an improvement overall.

Test Plan:
  - Viewed repository history.
  - Viewed branch history.
  - Viewed file history.
  - Viewed table of contents on a commit.
  - Viewed merged changes on a merge commit.
  - Viewed a directory containing an external.
  - Viewed a deleted file.

{F788419}

{F788420}

{F788421}

{F788422}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9126

Differential Revision: https://secure.phabricator.com/D14096

src/applications/diffusion/controller/DiffusionRepositoryController.php

@@ -177,8 +177,7 @@ final class DiffusionRepositoryController extends DiffusionController {
     $content[] = $this->buildHistoryTable(
       $history_results,
       $history,
-      $history_exception,
-      $handles);
+      $history_exception);
 
     try {
       $content[] = $this->buildTagListTable($drequest);
@@ -519,8 +518,7 @@ final class DiffusionRepositoryController extends DiffusionController {
   private function buildHistoryTable(
     $history_results,
     $history,
-    $history_exception,
-    array $handles) {
+    $history_exception) {
 
     $request = $this->getRequest();
     $viewer = $request->getUser();
@@ -544,7 +542,6 @@ final class DiffusionRepositoryController extends DiffusionController {
     $history_table = id(new DiffusionHistoryTableView())
       ->setUser($viewer)
       ->setDiffusionRequest($drequest)
-      ->setHandles($handles)
       ->setHistory($history);
 
     // TODO: Super sketchy.