Fix showscenegraph warnings

components/sceneutil/serialize.cpp

@@ -125,6 +125,7 @@ void registerSerializers()
             "SceneUtil::CompositeStateSetUpdater",
             "SceneUtil::LightListCallback",
             "SceneUtil::LightManagerUpdateCallback",
+            "SceneUtil::NodeCallback",
             "SceneUtil::UpdateRigBounds",
             "SceneUtil::UpdateRigGeometry",
             "SceneUtil::LightSource",
@@ -132,6 +133,7 @@ void registerSerializers()
             "SceneUtil::DisableLight",
             "SceneUtil::MWShadowTechnique",
             "SceneUtil::TextKeyMapHolder",
+            "Shader::AddedState",
             "Shader::RemovedAlphaFunc",
             "NifOsg::LightManagerStateAttribute",
             "NifOsg::FlipController",