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/DecalControls/ControlImpl.h

@@ -0,0 +1,155 @@
+// ControlImpl.h
+// Default interface Implementations for controls
+
+#ifndef __CONTROLIMPL_H
+#define __CONTROLIMPL_H
+
+#include "..\Inject\SinkImpl.h"
+
+template< class cImpl, class ILayoutItf, const IID *pDispIID, const GUID *pLib >
+class ATL_NO_VTABLE ILayoutImpl
+: public IControlImpl< cImpl, ILayoutItf, pDispIID, pLib >,
+public ILayerRenderImpl,
+public ILayerSchema
+{
+public:
+   ILayoutImpl()
+      // Initialize in the static range
+      : m_nNextControlID( 1000 )
+   {
+   }
+
+   long m_nNextControlID;
+
+   // Override this function for custom schema fun
+   void onSchemaLoad( IView *, MSXML::IXMLDOMElementPtr & )
+   {
+   }
+
+   long loadChildControl( IView *pView, const MSXML::IXMLDOMElementPtr &pChild )
+   {
+      _ASSERTE( pView != NULL );
+      _ASSERTE( pChild.GetInterfacePtr() != NULL );
+
+      long nAssigned;
+      pView->LoadControl( static_cast< cImpl * >( this )->m_pSite, ++ m_nNextControlID, pChild, &nAssigned );
+
+      return nAssigned;
+   }
+
+   long dispenseID()
+   {
+      return ++ m_nNextControlID;
+   }
+
+   CComPtr< IImageCache > m_pBackground;
+
+   // ILayout Methods
+   STDMETHOD(get_Background)( IImageCacheDisp **ppVal )
+   {
+      _ASSERTE( ppVal != NULL );
+
+      if( m_pBackground.p == NULL )
+         *ppVal = NULL;
+      else
+         m_pBackground->QueryInterface( ppVal );
+
+      return S_OK;
+   }
+
+   STDMETHOD(putref_Background)( IImageCacheDisp *pCache )
+   {
+      if( m_pBackground.p )
+         m_pBackground.Release();
+
+      if( pCache != NULL )
+         pCache->QueryInterface( &m_pBackground );
+
+      static_cast< cImpl * >( this )->m_pSite->Invalidate();
+
+      return S_OK;
+   }
+
+   // ILayerRender Methods
+   STDMETHOD(Render)( ICanvas *pCanvas )
+   {
+      if( m_pBackground.p == NULL )
+         // No background means no drawing
+         return S_OK;
+
+      // Tile the background into the clipping area
+      ClipParams cp;
+      pCanvas->GetClipParams( &cp );
+
+      RECT rc = { cp.org.x, cp.org.y, cp.org.x + ( cp.window.right - cp.window.left ),
+         cp.org.y + ( cp.window.bottom - cp.window.top ) };
+
+      m_pBackground->PatBlt( pCanvas, &rc, &cp.org );
+
+      return S_OK;
+   }
+
+   // ILayerSchema Methods
+   STDMETHOD(SchemaLoad)(IView *pView, IUnknown *pXMLSchema )
+   {
+      MSXML::IXMLDOMElementPtr pElement = pXMLSchema;
+      CComPtr< IPluginSite > pPluginSite;
+      static_cast< cImpl * >( this )->m_pSite->get_PluginSite( &pPluginSite );
+
+      HRESULT hRes = pPluginSite->LoadImageSchema( pXMLSchema, &m_pBackground );
+      _ASSERTE( SUCCEEDED( hRes ) );
+
+      static_cast< cImpl * >( this )->onSchemaLoad( pView, pElement );
+
+      return S_OK;
+   }
+};
+
+template< UINT nID, class cImpl >
+class IScrollerEventsImpl
+: public IControlEventsImpl< nID, cImpl, &DIID_IScrollerEvents, &LIBID_DecalControls >
+{
+};
+
+template< UINT nID, class cImpl >
+class IListEventsImpl
+: public IControlEventsImpl< nID, cImpl, &DIID_IListEvents, &LIBID_DecalControls >
+{
+};
+
+template< UINT nID, class cImpl >
+class INotebookEventsImpl
+: public IControlEventsImpl< nID, cImpl, &DIID_INotebookEvents, &LIBID_DecalControls >
+{
+};
+
+#define DISPID_BEGIN 10
+#define DISPID_END 11
+
+template< UINT nID, class cImpl >
+class IEditEventsImpl
+: public IControlEventsImpl< nID, cImpl, &DIID_IEditEvents, &LIBID_DecalControls >
+{
+};
+
+#define DISPID_DROPDOWN 12
+
+template< UINT nID, class cImpl >
+class IChoiceEventsImpl
+: public IControlEventsImpl< nID, cImpl, &DIID_IChoiceEvents, &LIBID_DecalControls >
+{
+};
+
+template< UINT nID, class cImpl >
+class ICheckboxEventsImpl
+: public IControlEventsImpl< nID, cImpl, &DIID_ICheckboxEvents, &LIBID_DecalControls >
+{
+};
+
+template< UINT nID, class cImpl >
+class ISliderEventsImpl
+: public IControlEventsImpl< nID, cImpl, &DIID_ISliderEvents, &LIBID_DecalControls >
+{
+};
+
+#endif