add Scene::getWorldEntities() and Scene::getHudEntities()

Author: jube

include/gf/Scene.h

@@ -374,6 +374,20 @@ inline namespace v1 {
       return m_hudView;
     }
 
+    /**
+     * @brief Get the world entities
+     */
+    EntityContainer& getWorldEntities() {
+      return m_worldEntities;
+    }
+
+    /**
+     * @brief Get the HUD entities
+     */
+    EntityContainer& getHudEntities() {
+      return m_hudEntities;
+    }
+
     /**
      * @brief Customization point for processEvent()
      *