From Wang Rui, "I modified the Serializer header to add a UPDATE_TO_VERSION_SCOPED

macro, which could set version within brackets and reset it after
that. All related serializers are also modified so that the
backward-compatibility bug reported by Farshid can be fixed.
"

From Robert Osfield, removed the use of osg::Referenced and creating the proxy object on the heap.

include/osgDB/Serializer

@@ -977,6 +977,9 @@ public:
 #define UPDATE_TO_VERSION(VER) \
     wrapper->setUpdatedVersion( (VER) );
 
+#define UPDATE_TO_VERSION_SCOPED(VER) \
+    osgDB::UpdateWrapperVersionProxy uwvp(wrapper, (VER));
+
 #define REMOVE_SERIALIZER(PROP) \
     wrapper->markSerializerAsRemoved( #PROP );