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/DecalNet/MessageVector.h

@@ -0,0 +1,37 @@
+// MessageVector.h : Declaration of the cMessageVector
+
+#ifndef __MESSAGEVECTOR_H_
+#define __MESSAGEVECTOR_H_
+
+#include "resource.h"       // main symbols
+#include "MessageImpl.h"
+
+/////////////////////////////////////////////////////////////////////////////
+// cMessageVector
+class ATL_NO_VTABLE cMessageVectorIter : 
+	public CComObjectRootEx<CComSingleThreadModel>,
+	public IDispatchImpl<IMessageMember, &IID_IMessageMember, &LIBID_DecalNet>,
+	public IMessageIteratorSublistImpl
+{
+public:
+	cMessageVectorIter()
+	{
+	}
+
+BEGIN_COM_MAP(cMessageVectorIter)
+   COM_INTERFACE_ENTRY(IMessageMember)
+	COM_INTERFACE_ENTRY(IMessageIterator)
+	COM_INTERFACE_ENTRY2(IDispatch, IMessageMember)
+END_COM_MAP()
+
+public:
+   // IMessageIterator Overrides
+   STDMETHOD(get_MemberName)(BSTR *pVal);
+
+   // IMessageMember Implementation
+	STDMETHOD(get_Count)(/*[out, retval]*/ long *pVal);
+	STDMETHOD(get_Member)(VARIANT vIndex, /*[out, retval]*/ VARIANT *pVal);
+	STDMETHOD(get_MemberName)(long Index, BSTR *pVal);
+};
+
+#endif //__MESSAGEVECTOR_H_