Added support for DYNAMIC/STATIC osg::Transform types and added new osg::Drawable::getStats

and supportsAttributeUpdate(..) and applyAttributeUpdate(...) methods which will
be to enable hooks into Drawable subclasses.

src/osg/Transform.cpp

@@ -4,6 +4,7 @@ using namespace osg;
 
 Transform::Transform()
 {
+    _type = DYNAMIC;
     _matrix = new osg::Matrix();
     _matrix->makeIdent();
 }
@@ -11,6 +12,7 @@ Transform::Transform()
 
 Transform::Transform(const Matrix& mat )
 {
+    _type = DYNAMIC;
     (*_matrix) = mat;
 }