Cryptomatte support on GPU

Support Isolate Selected for materials and maps: Isolate Selected in the Arnold RenderView now works for materials and maps as well as objects and lights. To use this, make sure no objects or lights are selected, and then select one (or more) materials or maps in SME. The selected materials and maps are rendered in the Arnold RenderView, making it easier to debug complicated shader trees. (MAXTOA-1852)