Gaffer.mtd : Add metadata for parameters added in Arnold 5.3
Gaffer.mtd : Add metadata for parameters added in Arnold 5.3

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