Reduce json serialisation in GLB writer#87
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In
cityjson-convert/src/gltf_writer.rs, the GLB writer was reworked to reduce JSON serialization churn. Instead of serializing the glTF root to serde_json::Value, mutating it for extensions, and serializing again, extensions are attached directly to typed gltf::json structures and the root is serialized once. The export path also now consumes more of its intermediate scene state instead of cloning it unnecessarily.