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/Hud.cs

@@ -0,0 +1,86 @@
+using System;
+using System.Runtime.InteropServices;
+using Decal.Interop.Render;
+
+namespace Decal.Adapter.Wrappers;
+
+[CLSCompliant(true)]
+public class Hud : HudRenderScalable
+{
+	private HUDView internalView;
+
+	internal HUDView Underlying => internalView;
+
+	public bool Enabled
+	{
+		get
+		{
+			return internalView.Enabled;
+		}
+		set
+		{
+			internalView.Enabled = value;
+		}
+	}
+
+	public int Id => internalView.ID;
+
+	public float Angle
+	{
+		get
+		{
+			return internalView.Angle;
+		}
+		set
+		{
+			internalView.Angle = value;
+		}
+	}
+
+	public int Alpha
+	{
+		get
+		{
+			return internalView.Alpha;
+		}
+		set
+		{
+			internalView.Alpha = value;
+		}
+	}
+
+	internal event EventHandler Disposing;
+
+	internal Hud(HUDView view)
+		: base(view)
+	{
+		internalView = view;
+	}
+
+	public void SetBackground(Background background)
+	{
+		if (background != null)
+		{
+			internalView.SetBackground(background.Underlying);
+			return;
+		}
+		throw new ArgumentNullException("background");
+	}
+
+	protected override void Dispose(bool disposing)
+	{
+		try
+		{
+			if (disposing && this.Disposing != null)
+			{
+				this.Disposing(this, new EventArgs());
+			}
+			Marshal.ReleaseComObject(internalView);
+			internalView = null;
+		}
+		finally
+		{
+			base.Dispose(disposing);
+		}
+	}
+}