Added attribute inheritance diagramming to SceneInspector.
Added attribute inheritance diagramming to SceneInspector.

This allows the user to see how an attribute has been inherited through the hierarchy to the inspected path, with each change of value being shown in diff form.

hradec/gaffer,ImageEngine/gaffer,goddardl/gaffer,cedriclaunay/gaffer,chippey/gaffer,goddardl/gaffer,cedriclaunay/gaffer,johnhaddon/gaffer,andrewkaufman/gaffer,appleseedhq/gaffer,GafferHQ/gaffer,appleseedhq/gaffer,johnhaddon/gaffer,chippey/gaffer,andrewkaufman/gaffer,boberfly/gaffer,johnhaddon/gaffer,ivanimanishi/gaffer,johnhaddon/gaffer,ImageEngine/gaffer,appleseedhq/gaffer,lucienfostier/gaffer,goddardl/gaffer,chippey/gaffer,hradec/gaffer,ivanimanishi/gaffer,hradec/gaffer,hradec/gaffer,ImageEngine/gaffer,andrewkaufman/gaffer,boberfly/gaffer,ImageEngine/gaffer,johnhaddon/gaffer,ivanimanishi/gaffer,boberfly/gaffer,cedriclaunay/gaffer,lucienfostier/gaffer,chippey/gaffer,andrewkaufman/gaffer,lucienfostier/gaffer,hradec/gaffer,appleseedhq/gaffer,andrewkaufman/gaffer,boberfly/gaffer,GafferHQ/gaffer,GafferHQ/gaffer,cedriclaunay/gaffer,lucienfostier/gaffer,GafferHQ/gaffer,ivanimanishi/gaffer,goddardl/gaffer,GafferHQ/gaffer