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/InputBuffer.h

@@ -0,0 +1,93 @@
+// InputBuffer.h : Declaration of the cInputBuffer
+
+#ifndef __INPUTBUFFER_H_
+#define __INPUTBUFFER_H_
+
+#include "resource.h"       // main symbols
+#include "DecalInputCP.h"
+
+/////////////////////////////////////////////////////////////////////////////
+// cInputBuffer
+class ATL_NO_VTABLE cInputBuffer : 
+	public CComObjectRootEx<CComSingleThreadModel>,
+	public CComCoClass<cInputBuffer, &CLSID_InputBuffer>,
+	public IConnectionPointContainerImpl<cInputBuffer>,
+   public IProvideClassInfo2Impl< &CLSID_InputBuffer, &DIID_IInputBufferEvents, &LIBID_DecalInput >,
+	public IDispatchImpl<IInputBuffer, &IID_IInputBuffer, &LIBID_DecalInput>,
+   public IInputActionSite,
+   public CProxyIInputBufferEvents< cInputBuffer >
+{
+public:
+	cInputBuffer()
+      : m_bWaiting( false ),
+      m_nUntilTime( 0 )
+	{
+	}
+
+   void FinalRelease();
+
+   _variant_t m_tag;
+
+   enum eEntryType
+   {
+      eExecute,
+      ePush,
+      ePop
+   };
+
+   struct cEntry
+   {
+      eEntryType m_eType;
+      CComPtr< IInputAction > m_pAction;
+   };
+
+   typedef std::list< cEntry > cEntryList;
+   cEntryList m_entries;
+
+   typedef std::stack< cEntry * > cEntryStack;
+   cEntryStack m_insertstack, m_playstack;
+   cEntryList::iterator m_play;
+
+   bool checkState();
+   HRESULT addItem( BSTR strInit, IInputAction **ppAction );
+   void runActions();
+
+   // Delay information
+   bool m_bWaiting;
+   long m_nUntilTime;
+
+DECLARE_REGISTRY_RESOURCEID(IDR_INPUTBUFFER)
+
+DECLARE_PROTECT_FINAL_CONSTRUCT()
+
+BEGIN_COM_MAP(cInputBuffer)
+   COM_INTERFACE_ENTRY(IInputActionSite)
+	COM_INTERFACE_ENTRY(IInputBuffer)
+	COM_INTERFACE_ENTRY(IDispatch)
+   COM_INTERFACE_ENTRY(IProvideClassInfo)
+   COM_INTERFACE_ENTRY(IProvideClassInfo2)
+	COM_INTERFACE_ENTRY_IMPL(IConnectionPointContainer)
+END_COM_MAP()
+BEGIN_CONNECTION_POINT_MAP(cInputBuffer)
+   CONNECTION_POINT_ENTRY(DIID_IInputBufferEvents)
+END_CONNECTION_POINT_MAP()
+
+public:
+   // IInputActionSite
+	STDMETHOD(Delay)(long Time, VARIANT_BOOL Advance);
+	STDMETHOD(FireEvent)(long nEventID, VARIANT vParam);
+	STDMETHOD(MoveMouse)(long X, long Y);
+	STDMETHOD(get_Service)(/*[out, retval]*/ IInputService * *pVal);
+
+   // IInputBuffer
+	STDMETHOD(Stop)();
+	STDMETHOD(Run)();
+	STDMETHOD(get_CanRun)(/*[out, retval]*/ VARIANT_BOOL *pVal);
+	STDMETHOD(Pop)();
+	STDMETHOD(Push)(BSTR Command);
+	STDMETHOD(Add)(BSTR Command);
+	STDMETHOD(get_Tag)(/*[out, retval]*/ VARIANT *pVal);
+	STDMETHOD(put_Tag)(/*[in]*/ VARIANT newVal);
+};
+
+#endif //__INPUTBUFFER_H_