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/PlainText/ScriptSiteImpl.h

@@ -0,0 +1,82 @@
+// ScriptSiteImpl.h
+// Declaration of class IActiveScriptSiteImpl
+
+#ifndef __SCRIPTSITEIMPL_H
+#define __SCRIPTSITEIMPL_H
+
+class IActiveScriptSiteImpl
+: public IActiveScriptSite
+{
+   class cObject
+   {
+   public:
+      cObject( BSTR szName, IUnknown *pObject )
+         : m_strName( szName ),
+         m_pObject( pObject )
+      {
+      }
+
+      _bstr_t m_strName;
+      CComPtr< IUnknown > m_pObject;
+   };
+
+public:
+
+   typedef std::deque< cObject > cObjectList;
+   cObjectList m_objects;
+
+   CComPtr< IActiveScript > m_pScript;
+
+   IActiveScriptSiteImpl()
+      : m_pScript( NULL )
+   {
+   }
+
+   HRESULT createScriptEngine( LPCOLESTR strLanguage );
+
+   // Helper functions
+   void addNamedItem( BSTR szName, IUnknown *pObject, DWORD dwFlags = SCRIPTITEM_ISSOURCE | SCRIPTITEM_ISVISIBLE );
+
+   // IActiveScriptSite Methods
+   STDMETHOD(GetLCID)(LCID *plcid)
+   {
+      return E_NOTIMPL;
+   }
+
+   STDMETHOD(GetItemInfo)(LPCOLESTR pstrName, DWORD dwReturnMask, IUnknown **ppunkItem, ITypeInfo **ppTypeInfo);
+   STDMETHOD(GetDocVersionString)(BSTR *pbstrVersionString)
+   {
+      return E_NOTIMPL;
+   }
+
+   STDMETHOD(OnScriptTerminate)(const VARIANT *pvarResult, const EXCEPINFO *pexcepinfo)
+   {
+      return S_OK;
+   }
+
+   STDMETHOD(OnStateChange)(SCRIPTSTATE ssScriptState)
+   {
+      if( ssScriptState == SCRIPTSTATE_CLOSED )
+      {
+         m_objects.clear();
+         m_pScript.Release();
+      }
+
+      return S_OK;
+   }
+
+   STDMETHOD(OnScriptError)(IActiveScriptError *pase);
+
+   STDMETHOD(OnEnterScript)()
+   {
+      return S_OK;
+   }
+
+   STDMETHOD(OnLeaveScript)()
+   {
+      return S_OK;
+   }
+};
+
+#endif
+