Added right click menu for Box plugs in NodeGraph.
Added right click menu for Box plugs in NodeGraph.

This allows the renaming and deletion of promoted nodules.

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