[Media] Copy media subsystem from v2 and roughly structure it for v3

plugins/Directory/Directory.php

@@ -28,11 +28,7 @@ use App\Core\Router\RouteLoader;
 class Directory extends Module
 {
     /**
-     * Map URLs to actions
-     *
-     * @param RouteLoader $r
-     *
-     * @return bool hook value; true means continue processing, false means stop.
+     * Map URLs to Controllers
      */
     public function onAddRoute(RouteLoader $r)
     {