- mesh with multiple material ids but single material(i.e. not a multimaterial) is consolidated into single mesh with one material slot. Simple test - create a box(in Max it defaults to 6 matIds) and assign a material then sync/export/observe
- sorted material slots to make them in the same order as in multimaterial
- unused materials removed from Datasmith scene. I.e. assign material - sync - assign different material - first material should go away from udatasmith if not used on other nodes
#jira UE-143713
#preflight 6229002ccc09078bab5cadf5
#rb benoit.deschenes
[CL 19333134 by kerim borchaev in ue5-main branch]
This represents UE4/Main @18073326, Release-5.0 @18081140 and Dev-PerfTest @18045971
[CL 18081471 by aurel cordonnier in ue5-release-engine-test branch]
