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>

Managed/Decal.Adapter/Decal.Adapter.Wrappers/DecalWrapper.cs

@@ -0,0 +1,84 @@
+using System;
+using System.ComponentModel;
+using System.Runtime.InteropServices;
+using Decal.Adapter.Support;
+using Decal.Interop.Core;
+
+namespace Decal.Adapter.Wrappers;
+
+[CLSCompliant(true)]
+public class DecalWrapper : MarshalByRefObject, IDisposable
+{
+	internal static Guid IID_IDISPATCH = new Guid("{00020400-0000-0000-C000-000000000046}");
+
+	internal static Guid IID_IUNKNOWN = new Guid("{00000000-0000-0000-C000-000000000046}");
+
+	private DecalCore myDecal;
+
+	private bool isDisposed;
+
+	[CLSCompliant(false)]
+	[EditorBrowsable(EditorBrowsableState.Never)]
+	public DecalCore Underlying => myDecal;
+
+	public IntPtr Hwnd => new IntPtr(myDecal.HWND);
+
+	public bool Focus => myDecal.Focus;
+
+	internal DecalWrapper(DecalCore decal)
+	{
+		myDecal = decal;
+	}
+
+	~DecalWrapper()
+	{
+		Dispose(disposing: false);
+	}
+
+	public void Dispose()
+	{
+		Dispose(disposing: true);
+		GC.SuppressFinalize(this);
+	}
+
+	private void Dispose(bool disposing)
+	{
+		if (!isDisposed)
+		{
+		}
+		if (myDecal != null)
+		{
+			Marshal.ReleaseComObject(myDecal);
+			myDecal = null;
+		}
+		isDisposed = true;
+	}
+
+	public object GetObject(string path)
+	{
+		return GetObject(path, IID_IDISPATCH);
+	}
+
+	public object GetObject(string path, string iid)
+	{
+		return GetObject(path, new Guid(iid));
+	}
+
+	public object GetObject(string path, Guid iid)
+	{
+		try
+		{
+			return ((dynamic)(IDecalCore)myDecal).get_Object(path, ref iid);
+		}
+		catch (Exception ex)
+		{
+			Util.WriteLine("Exception for {0} during get_Object: {1}", path, ex);
+			return null;
+		}
+	}
+
+	public string MapPath(string path)
+	{
+		return myDecal.MapPath(path);
+	}
+}