clean up "Add" menubar categoes on the 3d object side via the following:

SceneObject now defaults to a category of "misc"
getCategoryOfClass now checks parent classes for what categories they hold so that variants can inherit
categories are in one of a few rough groups and subgroups depending on actual mapper needs/usages

Engine/source/T3D/fx/fxShapeReplicator.h

@@ -59,6 +59,7 @@ public:
    void setTransform(const MatrixF & mat) { Parent::setTransform(mat); setRenderTransform(mat); };
 
    DECLARE_CONOBJECT(fxShapeReplicatedStatic);
+   DECLARE_CATEGORY("UNLISTED");
 };
 
 
@@ -187,6 +188,7 @@ public:
 
    // Declare Console Object.
    DECLARE_CONOBJECT(fxShapeReplicator);
+   DECLARE_CATEGORY("UNLISTED");
 };
 
 #endif // _SHAPEREPLICATOR_H_