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/DecalNet/MessageParsers.h

@@ -0,0 +1,48 @@
+// MessageParsers.h
+// Declaration of class cMessageParser - base class for parsing the
+// XML Schema
+
+#ifndef __MESSAGEPARSERS_H
+#define __MESSAGEPARSERS_H
+
+#include "Message.h"
+
+class cElementParser
+{
+public:
+   class cContext
+   {
+      cContext *m_pParent;
+      cMessage::cElementList *m_pElements;
+      DWORD m_dwStartOffset;
+
+   public:
+      cContext( cMessage::cElementList *pElements, cContext *pParent = NULL )
+         : m_pParent( pParent ),
+         m_pElements( pElements ),
+         m_dwStartOffset( pElements->size() )
+      {
+      }
+
+      cMessage::cMessageElement *findElement( const _bstr_t &strElement );
+      bool parseChildren( MSXML::IXMLDOMElementPtr &pElement );
+      bool parseChildren( cMessage::cElementList &elements, MSXML::IXMLDOMElementPtr &pElement );
+
+      static _bstr_t g_strAll;
+   };
+
+   virtual cMessage::cMessageElement *parse( cContext &context, MSXML::IXMLDOMElementPtr &pElement ) = 0;
+
+   static cElementParser *lookup( const _bstr_t &strElement );
+
+   static void init();
+   static void term();
+
+private:
+   static void addParser( LPCTSTR szElement, cElementParser *pParser );
+
+   typedef std::map< _bstr_t, VSBridge::auto_ptr< cElementParser > > cElementParserMap;
+   static cElementParserMap g_parsers;
+};
+
+#endif