Updated TODO list.

Converted AnimationPath so it is now subclassed from osg::Transform::ComputeTransfromCallback()
so that it can be directly attached to the scene to move objects about.

Changed the osg::SateSet::setGlobalDefaults() so that is sets GL_DEPTH_TEST
to ON.

Added guards and creation of default helper classes in osgGLUT::Viewer and
osgUtil::SceneView so that sensible defaults are used when no settings
are used of osg::State/StateSet,osgUtil::RenderStage/RenderGraph/CullVisitor.

src/osg/StateSet.cpp

@@ -130,6 +130,7 @@ void StateSet::setGlobalDefaults()
     setRendingBinToInherit();
 
 
+    setMode(GL_DEPTH_TEST,StateAttribute::ON);
     setAttributeAndModes(osgNew AlphaFunc,StateAttribute::OFF);
     setAttributeAndModes(osgNew Transparency,StateAttribute::OFF);