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/PolledDelayAction.h

@@ -0,0 +1,84 @@
+// PolledDelayAction.h : Declaration of the cPolledDelayAction
+
+#ifndef __POLLEDDELAYACTION_H_
+#define __POLLEDDELAYACTION_H_
+
+#include "resource.h"       // main symbols
+#include <DecalInputImpl.h>
+
+/////////////////////////////////////////////////////////////////////////////
+// cPolledDelayAction
+class ATL_NO_VTABLE cPolledDelayAction : 
+	public CComObjectRootEx<CComSingleThreadModel>,
+	public CComCoClass<cPolledDelayAction, &CLSID_PolledDelayAction>,
+	public IInputActionImpl< cPolledDelayAction >
+{
+public:
+	cPolledDelayAction()
+      : m_bFirst( true )
+	{
+	}
+
+   bool m_bFirst;
+   long m_nTime,
+      m_nEvent;
+
+   HRESULT load( LPTSTR szBuffer )
+   {
+      int nSep = ::_tcscspn( szBuffer, _T( ";" ) );
+      if( nSep == -1 )
+         return E_INVALIDARG;
+
+      szBuffer[ nSep ] = _T( '\0' );
+      if( ::_stscanf( szBuffer, _T( "%i" ), &m_nTime ) != 1 )
+         return E_INVALIDARG;
+
+      if( ::_stscanf( szBuffer + nSep + 1, _T( "%i" ), &m_nEvent ) != 1 )
+         return E_INVALIDARG;
+
+      return S_OK;
+   }
+
+DECLARE_REGISTRY_RESOURCEID(IDR_POLLEDDELAYACTION)
+
+DECLARE_PROTECT_FINAL_CONSTRUCT()
+
+BEGIN_COM_MAP(cPolledDelayAction)
+	COM_INTERFACE_ENTRY(IInputAction)
+END_COM_MAP()
+
+// IPolledDelayAction
+public:
+   STDMETHOD(Reset)()
+   {
+      m_bFirst = true;
+      return S_OK;
+   }
+
+   STDMETHOD(Execute)()
+   {
+      if( !m_bFirst )
+      {
+         // Fire the event to figure out if we should continue
+         VARIANT_BOOL bContinue = VARIANT_FALSE;
+         VARIANT vParam;
+         vParam.vt = VT_BOOL | VT_BYREF;
+         vParam.pboolVal = &bContinue;
+         
+         m_pSite->FireEvent( m_nEvent, vParam );
+
+         if( !bContinue )
+            // Abort and let it carry on
+            return S_OK;
+      }
+      else
+         // Clear the first flag
+         m_bFirst = false;
+
+      m_pSite->Delay( m_nTime, VARIANT_FALSE );
+
+      return S_OK;
+   }
+};
+
+#endif //__POLLEDDELAYACTION_H_