refactor: streamline menu dumping

src/ObjWriting/Game/IW4/Menu/MenuWriterIW4.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "Game/IW4/IW4.h"
+#include "Menu/IMenuWriter.h"
+
+#include <memory>
+#include <string>
+
+namespace IW4::menu
+{
+    class IWriterIW4 : public ::menu::IWriter
+    {
+    public:
+        virtual void WriteFunctionDef(const std::string& functionName, const Statement_s* statement) = 0;
+        virtual void WriteMenu(const menuDef_t& menu) = 0;
+    };
+
+    std::unique_ptr<IWriterIW4> CreateMenuWriter(std::ostream& stream);
+} // namespace IW4::menu