From Wang Rui, new native binary/ascii format infrastructure and wrappers.

From Robert Osfield, refactor of Wang Rui's original osg2 into 3 parts - parts placed into osgDB, the ReaderWriter placed into src/osg/Plugin/osg and wrappers into src/osgWrappers/serializers/osg

src/osgWrappers/serializers/osg/StateAttribute.cpp

@@ -0,0 +1,13 @@
+#include <osg/StateAttribute>
+#include <osgDB/ObjectWrapper>
+#include <osgDB/InputStream>
+#include <osgDB/OutputStream>
+
+REGISTER_OBJECT_WRAPPER( StateAttribute,
+                         /*new osg::StateAttribute*/NULL,
+                         osg::StateAttribute,
+                         "osg::Object osg::StateAttribute" )
+{
+    ADD_OBJECT_SERIALIZER( UpdateCallback, osg::StateAttributeCallback, NULL );  // _updateCallback
+    ADD_OBJECT_SERIALIZER( EventCallback, osg::StateAttributeCallback, NULL );  // _eventCallback
+}