add iw3 asset dumping basics

src/ObjWriting/Game/IW3/AssetDumpers/AssetDumperGfxImage.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <memory>
+
+#include "Dumping/AbstractAssetDumper.h"
+#include "Game/IW3/IW3.h"
+#include "Image/IImageWriter.h"
+
+namespace IW3
+{
+    class AssetDumperGfxImage final : public AbstractAssetDumper<GfxImage>
+    {
+        std::unique_ptr<IImageWriter> m_writer;
+
+    protected:
+        bool ShouldDump(XAssetInfo<GfxImage>* asset) override;
+        bool CanDumpAsRaw() override;
+        std::string GetFileNameForAsset(Zone* zone, XAssetInfo<GfxImage>* asset) override;
+        void DumpRaw(AssetDumpingContext& context, XAssetInfo<GfxImage>* asset, std::ostream& stream) override;
+
+    public:
+        AssetDumperGfxImage();
+    };
+}