DataTypeHook: also add getSetting helper method

library/Director/Hook/DataTypeHook.php

@@ -40,4 +40,13 @@ abstract class DataTypeHook
         $this->settings = $settings;
         return $this;
     }
+
+    public function getSetting($name, $default = null)
+    {
+        if (array_key_exists($name, $this->settings)) {
+            return $this->settings[$name];
+        } else {
+            return $default;
+        }
+    }
 }