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/ShadeModel.cpp

@@ -0,0 +1,15 @@
+#include <osg/ShadeModel>
+#include <osgDB/ObjectWrapper>
+#include <osgDB/InputStream>
+#include <osgDB/OutputStream>
+
+REGISTER_OBJECT_WRAPPER( ShadeModel,
+                         new osg::ShadeModel,
+                         osg::ShadeModel,
+                         "osg::Object osg::StateAttribute osg::ShadeModel" )
+{
+    BEGIN_ENUM_SERIALIZER( Mode, SMOOTH );
+        ADD_ENUM_VALUE( FLAT );
+        ADD_ENUM_VALUE( SMOOTH );
+    END_ENUM_SERIALIZER();  // _mode
+}