Added UI support for OSL "help", "label" and "divider" metadata entries.
Added UI support for OSL "help", "label" and "divider" metadata entries.

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