Cloth - Tidy up ClothingAsset and ClothPhysicalMeshData to allow for more cloth data caching.
#rb Benn.Gallagher, Cedric.Caillaud, Michael.Forot
#preflight 16823444
#ROBOMERGE-SOURCE: CL 16882246
#ROBOMERGE-BOT: (v836-16769935)
[CL 16913004 by kriss gossart in ue5-main branch]