[Redesign] Remove PHUIActionHeaderView

Summary: This adds minor functionality to PHUIHeaderView (icons, tags) that were previously on in ActionHeader. This allows us to remove the PHUIActionHeaderView outright in favor of just one Header class.

Test Plan: Tested each callsite, workboards, hovercards, conpherence.

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D12902

src/applications/project/controller/PhabricatorProjectBoardViewController.php

@@ -362,7 +362,7 @@ final class PhabricatorProjectBoardViewController
       $project->getName());
 
     $header = id(new PHUIHeaderView())
-      ->setHeader(pht('%s Workboard', $header_link))
+      ->setHeader($header_link)
       ->setUser($viewer)
       ->setNoBackground(true)
       ->addActionLink($sort_menu)
@@ -370,12 +370,16 @@ final class PhabricatorProjectBoardViewController
       ->addActionLink($manage_menu)
       ->setPolicyObject($project);
 
+    $header_box = id(new PHUIBoxView())
+      ->appendChild($header)
+      ->addClass('project-board-header');
+
     $board_box = id(new PHUIBoxView())
       ->appendChild($board)
       ->addClass('project-board-wrapper');
 
     $nav = $this->buildIconNavView($project);
-    $nav->appendChild($header);
+    $nav->appendChild($header_box);
     $nav->appendChild($board_box);
 
     return $this->buildApplicationPage(
@@ -674,7 +678,7 @@ final class PhabricatorProjectBoardViewController
     }
 
     $column_button = id(new PHUIIconView())
-      ->setIconFont('fa-caret-down')
+      ->setIconFont('fa-gear')
       ->setHref('#')
       ->addSigil('boards-dropdown-menu')
       ->setMetadata(