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* Adding the ability to reference component material slots based on material slot name rather than just by index. This prevents breaking resolution of material parameter tracks when materials indices get reordered within a mesh, as long as the slot names remain consistent. This type of reordering can happen when reimporting meshes for example, as material order may not be consistent depending on your mesh authoring package. It can also happen when creating meshes dynamically, which certain customers do. For now, we try to match by slot name first, and then by index if we cannot find a material by its slot name (or one doesn't exist in the binding for backwards compatibility). In future we will introduce ways for the user to update or fix track bindings manually, for example in cases that material slot names are renamed. * Adding the ability to reference the OverlayMaterial in MeshComponents, and animate parameters in it, or change which material is assigned to the overlay material property using a material switcher track. * Formalizing binding to decal material- previously this was just done by default if the component the track was added to was a DecalComponent. The above refactor also allows us to more easily add animation of other types of material tracks in other components. In addition to the above, I've exposed the Material Slot Name (read-only) in the outliner/details panel on PrimitiveComponent. Previously you could only see these slot names by opening the mesh asset. See design docs for this here and here: https://docs.google.com/document/d/137PB3QN-dBdESJGfrfscNsiQPZmhg9FxIFerU1M00uU/edit https://docs.google.com/document/d/18dlhZcJ8wE-b_Q9ulTpVirmmY_Na8w-5ZuZjeAA8oEI/edit #jira UE-119707, UE-189930 [REVIEW] [at]UE-Sequencer [CL 26915111 by david bromberg in ue5-main branch]