chore: use generic xmodel loader and dumper code for t5

src/ObjCommon/Game/T5/XModel/JsonXModel.h

@@ -0,0 +1,31 @@
+#pragma once
+
+#include "Json/JsonCommon.h"
+#include <memory>
+#include <optional>
+#include <string>
+#include <vector>
+
+namespace T5
+{
+    class JsonXModelLod
+    {
+    public:
+        std::string file;
+        float distance;
+    };
+
+    NLOHMANN_DEFINE_TYPE_EXTENSION(JsonXModelLod, file, distance);
+
+    class JsonXModel
+    {
+    public:
+        std::vector<JsonXModelLod> lods;
+        std::optional<int> collLod;
+        std::optional<std::string> physPreset;
+        std::optional<std::string> physConstraints;
+        unsigned flags;
+    };
+
+    NLOHMANN_DEFINE_TYPE_EXTENSION(JsonXModel, lods, collLod, physPreset, physConstraints, flags);
+} // namespace T5