Added visual indication of attribute inheritance in SceneInspector.
Added visual indication of attribute inheritance in SceneInspector.

Fixes #206.

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