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/DecalInput/MouseMoveAction.h

@@ -0,0 +1,71 @@
+// MouseMoveAction.h : Declaration of the cMouseMoveAction
+
+#ifndef __MOUSEMOVEACTION_H_
+#define __MOUSEMOVEACTION_H_
+
+#include "resource.h"       // main symbols
+#include <DecalInputImpl.h>
+
+/////////////////////////////////////////////////////////////////////////////
+// cMouseMoveAction
+class ATL_NO_VTABLE cMouseMoveAction : 
+	public CComObjectRootEx<CComSingleThreadModel>,
+	public CComCoClass<cMouseMoveAction, &CLSID_MouseMoveAction>,
+	public IInputActionImpl< cMouseMoveAction >
+{
+public:
+	cMouseMoveAction()
+	{
+	}
+
+   enum eDirection
+   {
+      eLeftTop,
+      eRightBottom,
+      ePercent
+   };
+
+   struct cValue
+   {
+      eDirection m_eDir;
+      long m_nMagnitude;
+
+      long value( long nMax )
+      {
+         switch( m_eDir )
+         {
+         case eLeftTop:
+            return m_nMagnitude;
+
+         case ePercent:
+            return ( ( nMax * m_nMagnitude ) / 100 );
+
+         case eRightBottom:
+            return nMax - m_nMagnitude;
+         }
+
+         // Unknown type
+         _ASSERT( FALSE );
+         return 0;
+      }
+   };
+
+   cValue m_x, m_y;
+
+   HRESULT onLoad( LPTSTR szData );
+   HRESULT loadValue( LPTSTR szData, cValue &val );
+
+DECLARE_REGISTRY_RESOURCEID(IDR_MOUSEMOVEACTION)
+
+DECLARE_PROTECT_FINAL_CONSTRUCT()
+
+BEGIN_COM_MAP(cMouseMoveAction)
+	COM_INTERFACE_ENTRY(IInputAction)
+END_COM_MAP()
+
+// IMouseMoveAction
+public:
+   STDMETHOD(Execute)();
+};
+
+#endif //__MOUSEMOVEACTION_H_