Added deletion tracking so when we delete a probe, it'll delete the prefilter/irrad bakes if they exist.

WIP of static cubemap bake(not working).

Engine/source/T3D/lighting/reflectionProbe.h

@@ -200,6 +200,8 @@ public:
    bool onAdd();
    void onRemove();
 
+   virtual void deleteObject();
+
    // Override this so that we can dirty the network flag when it is called
    void setTransform(const MatrixF &mat);
 
@@ -230,6 +232,8 @@ public:
    bool createClientResources();
    void generateTextures();
 
+   void processStaticCubemap();
+
    // This is the function that allows this object to submit itself for rendering
    void prepRenderImage(SceneRenderState *state);