Initial commit: Complete open-source Decal rebuild

All 5 phases of the open-source Decal rebuild:

Phase 1: 14 decompiled .NET projects (Interop.*, Adapter, FileService, DecalUtil)
Phase 2: 10 native DLLs rewritten as C# COM servers with matching GUIDs
  - DecalDat, DHS, SpellFilter, DecalInput, DecalNet, DecalFilters
  - Decal.Core, DecalControls, DecalRender, D3DService
Phase 3: C++ shims for Inject.DLL (D3D9 hooking) and LauncherHook.DLL
Phase 4: DenAgent WinForms tray application
Phase 5: WiX installer and build script

25 C# projects building with 0 errors.
Native C++ projects require VS 2022 + Windows SDK (x86).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Native/DecalFilters/AttributeInfo.h

@@ -0,0 +1,40 @@
+// AttributeInfo.h : Declaration of the cAttributeInfo
+
+#ifndef __ATTRIBUTEINFO_H_
+#define __ATTRIBUTEINFO_H_
+
+#include "resource.h"       // main symbols
+#include "CharacterStats.h"
+
+/////////////////////////////////////////////////////////////////////////////
+// cAttributeInfo
+class ATL_NO_VTABLE cAttributeInfo : 
+	public CComObjectRootEx<CComMultiThreadModel>,
+	public CComCoClass<cAttributeInfo, &CLSID_AttributeInfo>,
+	public IDispatchImpl<IAttributeInfo, &IID_IAttributeInfo, &LIBID_DecalFilters>
+{
+public:
+	cAttributeInfo()
+	{
+		m_pInfo = &m_pAttribInfo;
+	}
+
+   cCharacterStats::cAttributeInfo m_pAttribInfo;
+   cCharacterStats::cAttributeInfo *m_pInfo;
+
+DECLARE_PROTECT_FINAL_CONSTRUCT()
+
+BEGIN_COM_MAP(cAttributeInfo)
+	COM_INTERFACE_ENTRY(IAttributeInfo)
+	COM_INTERFACE_ENTRY(IDispatch)
+END_COM_MAP()
+
+// IAttributeInfo
+public:
+	STDMETHOD(get_Current)(/*[out, retval]*/ long *pVal);
+	STDMETHOD(get_Exp)(/*[out, retval]*/ long *pVal);
+	STDMETHOD(get_Creation)(/*[out, retval]*/ long *pVal);
+	STDMETHOD(get_Name)(/*[out, retval]*/ BSTR *pVal);
+};
+
+#endif //__ATTRIBUTEINFO_H_