feat: add json material loading/writing for iw3

src/ObjWriting/Game/IW3/Material/MaterialConstantZoneStateIW3.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include "Game/IW3/IW3.h"
+#include "Material/AbstractMaterialConstantZoneState.h"
+
+#include <string>
+
+namespace IW3
+{
+    class MaterialConstantZoneState final : public AbstractMaterialConstantZoneStateDx9
+    {
+    protected:
+        void ExtractNamesFromZoneInternal() override;
+        void ExtractNamesFromTechnique(const MaterialTechnique* technique);
+        void AddStaticKnownNames() override;
+        unsigned HashString(const std::string& str) override;
+    };
+} // namespace IW3