chore: implement base loading and writing of xmodel json

src/ObjCommon/Game/T6/Json/JsonXModel.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#include "Game/T6/T6.h"
+
+#include "Json/JsonCommon.h"
+#include "Json/JsonExtension.h"
+#include <memory>
+#include <nlohmann/json.hpp>
+#include <optional>
+#include <string>
+#include <vector>
+
+namespace T6
+{
+    class JsonXModelLod
+    {
+    public:
+        std::string file;
+    };
+
+    NLOHMANN_DEFINE_TYPE_EXTENSION(JsonXModelLod, file);
+
+    class JsonXModel
+    {
+    public:
+        std::vector<JsonXModelLod> lods;
+        unsigned collLod;
+        std::optional<std::string> physPreset;
+        std::optional<std::string> physConstraints;
+        unsigned flags;
+        JsonVec3 lightingOriginOffset;
+        float lightingOriginRange;
+    };
+
+    NLOHMANN_DEFINE_TYPE_EXTENSION(JsonXModel, lods, collLod, physPreset, physConstraints, flags, lightingOriginOffset, lightingOriginRange);
+} // namespace T6