convert I3dm metadata to EXT_structural_metadata and EXT_instance_features #1051
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The major refactor is to split the very rare case of EXT_mesh_gpu_instancing extension in the I3dm glTF into another function, and then reduce code duplication.
This class in PntsToGltfConverter.cpp is useful for dealing with instance metadata too.
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This mostly follows the lead of PntsToGltfConverter.cpp in converting the I3dm batch table to structural metadata and EXT_instance_features feature IDs. It does not handle the obscure case of an I3dm gltf model that already contains EXT_mesh_gpu_instancing instances. Tested with cesium-unreal and a tileset tiled from CZML.
Happy new year!