ArnoldLightUI : Improve plug layouts
ArnoldLightUI : Improve plug layouts

Improves light parameter ordering and grouping for Arnold lights

Improvements
------------

 ArnoldShaderUI : Improved the organisation of Arnold light parameters.

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