BoxUI : Added NodeGraph plug context menu for moving plugs.
BoxUI : Added NodeGraph plug context menu for moving plugs.

This allows them to be moved explicitly to the top/bottom/left/right of the NodeGadget they're on.

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