port 2A step 4: platform skeleton + rest of the 2V3 header closure

- Mirror the remaining non-Python 2V3 closure headers (98 more, 173 total): EffectLib,
  EterGrnLib, SpeedTreeLib, SphereLib, PRTerrainLib, EterImageLib, EterBase/Poly, cipher/tea,
  EterLib Grp*/IME/Input/MSWindow/StateManager, GameLib actor/map/race headers, EterPack.
- SDK shims: granny.h, SpeedTreeRT.h, imm.h, Dimm.h (the SDK MIDL header, not mirrored),
  dinput/d3dx8 additions; D3D8 render-state enums, FVF macros and the COM resource hierarchy;
  more Win32 GDI/handle types with layout static_asserts.
- PORT edits for MSVC-permissive code (typename, friend visibility, <algorithm>, pointer→uintptr_t)
  and PRTerrainLib/StdAfx.h dropping the ScriptLib/Python include.
- port_logic links the vendored cryptopp/minilzo.
- extension/src/platform: port_platform target with 103 generated stub files (1917 function
  stubs, 146 static members) from the new platform_stub.py (clang -ast-dump-filter);
  MT_PLATFORM_STUB() marks every unimplemented body. libmtgodot links port_platform and
  port_gate.sh builds it.

Gate: macOS, Android, iOS, Windows (mingw) PASS; Linux BLOCKED (no toolchain).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

extension/src/port/GameLib/ItemManager.h

@@ -0,0 +1,42 @@
+#pragma once
+
+#include "ItemData.h"
+
+class CItemManager : public CSingleton<CItemManager>
+{
+	public:
+		enum EItemDescCol
+		{
+			ITEMDESC_COL_VNUM,
+			ITEMDESC_COL_NAME,						
+			ITEMDESC_COL_DESC,
+			ITEMDESC_COL_SUMM,
+			ITEMDESC_COL_NUM,
+		};
+
+	public:
+		typedef std::map<DWORD, CItemData*> TItemMap;
+		typedef std::map<std::string, CItemData*> TItemNameMap;
+
+	public:
+		CItemManager();
+		virtual ~CItemManager();
+		
+		void			Destroy();
+
+		BOOL			SelectItemData(DWORD dwIndex);
+		CItemData *		GetSelectedItemDataPointer();
+
+		BOOL			GetItemDataPointer(DWORD dwItemID, CItemData ** ppItemData);
+		
+		/////
+		bool			LoadItemDesc(const char* c_szFileName);
+		bool			LoadItemList(const char* c_szFileName);
+		bool			LoadItemTable(const char* c_szFileName);
+		CItemData *		MakeItemData(DWORD dwIndex);
+
+	protected:
+		TItemMap m_ItemMap;
+		std::vector<CItemData*>  m_vec_ItemRange;
+		CItemData * m_pSelectedItemData;		
+};