GafferUI : Add Edge enum.
GafferUI : Add Edge enum.

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