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/DecalDat/DatStream.cpp

@@ -0,0 +1,95 @@
+// DatStream.cpp : Implementation of cDatStream
+#include "stdafx.h"
+#include "DecalDat.h"
+#include "DatStream.h"
+
+/////////////////////////////////////////////////////////////////////////////
+// cDatStream
+
+
+STDMETHODIMP cDatStream::get_Size(long *pVal)
+{
+   if( pVal == NULL )
+   {
+      _ASSERT( FALSE );
+      return E_POINTER;
+   }
+
+   *pVal = static_cast< long >( m_pFile->getSize() );
+
+	return S_OK;
+}
+
+STDMETHODIMP cDatStream::get_Tell(long *pVal)
+{
+   if( pVal == NULL )
+   {
+      _ASSERT( FALSE );
+      return E_POINTER;
+   }
+
+   *pVal = static_cast< long >( m_pFile->tell() );
+
+	return S_OK;
+}
+
+STDMETHODIMP cDatStream::Skip(long Bytes)
+{
+   if( Bytes < 0 )
+   {
+      _ASSERT( FALSE );
+      return E_INVALIDARG;
+   }
+
+   m_pFile->skip( static_cast< DWORD >( Bytes ) );
+
+	return S_OK;
+}
+
+STDMETHODIMP cDatStream::Restart()
+{
+   m_pFile->reset();
+
+	return S_OK;
+}
+
+STDMETHODIMP cDatStream::ReadBinary(long Bytes, BYTE *Buffer)
+{
+   if( Bytes < 0 )
+   {
+      _ASSERT( FALSE );
+      return E_INVALIDARG;
+   }
+
+   if( Buffer == NULL )
+   {
+      _ASSERT( FALSE );
+      return E_POINTER;
+   }
+
+   m_pFile->read( Buffer, static_cast< DWORD >( Bytes ) );
+
+	return S_OK;
+}
+
+STDMETHODIMP cDatStream::Read(long Bytes, BSTR *Data)
+{
+   if( Bytes < 0 )
+   {
+      _ASSERT( FALSE );
+      return E_INVALIDARG;
+   }
+
+   if( Data == NULL )
+   {
+      _ASSERT( FALSE );
+      return E_POINTER;
+   }
+
+   BYTE *Buffer = reinterpret_cast< BYTE * >( ::_alloca( Bytes ) );
+   m_pFile->read( Buffer, static_cast< DWORD >( Bytes ) );
+
+   *Data = ::SysAllocStringByteLen( reinterpret_cast< LPCTSTR >( Buffer ), Bytes );
+
+	return S_OK;
+}