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/Decal/Decal.cpp

@@ -0,0 +1,79 @@
+// Decal.cpp : Implementation of DLL Exports.
+
+
+// Note: Proxy/Stub Information
+//      To build a separate proxy/stub DLL, 
+//      run nmake -f Decalps.mk in the project directory.
+
+#include "stdafx.h"
+#include "resource.h"
+#include <initguid.h>
+#include <Decal.h>
+
+#include <Decal_i.c>
+#include "DecalManager.h"
+#include "SurrogateRemove.h"
+#include "ActiveXSurrogate.h"
+#include "DecalRes.h"
+#include "ACHooks.h"
+
+CComModule _Module;
+
+BEGIN_OBJECT_MAP(ObjectMap)
+OBJECT_ENTRY(CLSID_Decal, cDecal)
+OBJECT_ENTRY(CLSID_SurrogateRemove, cSurrogateRemove)
+OBJECT_ENTRY(CLSID_ActiveXSurrogate, cActiveXSurrogate)
+OBJECT_ENTRY(CLSID_DecalRes, cDecalRes)
+OBJECT_ENTRY(CLSID_ACHooks, cACHooks)
+END_OBJECT_MAP()
+
+/////////////////////////////////////////////////////////////////////////////
+// DLL Entry Point
+
+extern "C"
+BOOL WINAPI DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID /*lpReserved*/)
+{
+    if (dwReason == DLL_PROCESS_ATTACH)
+    {
+        _Module.Init(ObjectMap, hInstance, &LIBID_Decal);
+        DisableThreadLibraryCalls(hInstance);
+    }
+    else if (dwReason == DLL_PROCESS_DETACH)
+    {
+        _Module.Term();
+    }
+    return TRUE;    // ok
+}
+
+/////////////////////////////////////////////////////////////////////////////
+// Used to determine whether the DLL can be unloaded by OLE
+
+STDAPI DllCanUnloadNow(void)
+{
+    return (_Module.GetLockCount()==0) ? S_OK : S_FALSE;
+}
+
+/////////////////////////////////////////////////////////////////////////////
+// Returns a class factory to create an object of the requested type
+
+STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID* ppv)
+{
+    return _Module.GetClassObject(rclsid, riid, ppv);
+}
+
+/////////////////////////////////////////////////////////////////////////////
+// DllRegisterServer - Adds entries to the system registry
+
+STDAPI DllRegisterServer(void)
+{
+    // registers object, typelib and all interfaces in typelib
+    return _Module.RegisterServer(TRUE);
+}
+
+/////////////////////////////////////////////////////////////////////////////
+// DllUnregisterServer - Removes entries from the system registry
+
+STDAPI DllUnregisterServer(void)
+{
+    return _Module.UnregisterServer(TRUE);
+}