RWGltf → TCollection Relation

File in src/RWGltf	Includes file in src/TCollection
RWGltf_GltfPrimArrayData.hxx	TCollection_AsciiString.hxx
RWGltf_MaterialMetallicRoughness.hxx	TCollection_AsciiString.hxx
RWGltf_PrimitiveArrayReader.hxx	TCollection_AsciiString.hxx