cryptomatte support

A feature  I need most of all in Substance Designer . An ability to have masks from a cryptomatte exr.

So I finally could just use 3d rendered  things with proper collision  phisics  instead of those never working properly, as you want them to and never having  accurate anti-aliased alpha  splatters, samplers  , atlas scatter etc.

Some of 3d renders, gpu based are doing it quicker now and with better visual feadback.  Always look realistic. just out of a box with perfect AO and GI and whatever material phisical  properties  you want to bake.

It's beside a fact that scattering things in 3d soft is easier  usually. Just looks at geometry nodes in Blender .   They are so much easier to work with.  

Multi layer exr support would be nice too so we wouldn't have to maintain gazilion  macaroni lines  from one node to enother