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/DecalSupportLibraries/Attic/DlgProxy.h

@@ -0,0 +1,42 @@
+// DlgProxy.h: header file
+//
+
+#pragma once
+
+class CDecalSupportLibrariesDlg;
+
+
+// CDecalSupportLibrariesDlgAutoProxy command target
+
+class CDecalSupportLibrariesDlgAutoProxy : public CCmdTarget
+{
+	DECLARE_DYNCREATE(CDecalSupportLibrariesDlgAutoProxy)
+
+	CDecalSupportLibrariesDlgAutoProxy();           // protected constructor used by dynamic creation
+
+// Attributes
+public:
+	CDecalSupportLibrariesDlg* m_pDialog;
+
+// Operations
+public:
+
+// Overrides
+	public:
+	virtual void OnFinalRelease();
+
+// Implementation
+protected:
+	virtual ~CDecalSupportLibrariesDlgAutoProxy();
+
+	// Generated message map functions
+
+	DECLARE_MESSAGE_MAP()
+	DECLARE_OLECREATE(CDecalSupportLibrariesDlgAutoProxy)
+
+	// Generated OLE dispatch map functions
+
+	DECLARE_DISPATCH_MAP()
+	DECLARE_INTERFACE_MAP()
+};
+