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/WorldObjectCollection.cs

@@ -0,0 +1,154 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.ComponentModel;
+using Decal.Interop.Filters;
+
+namespace Decal.Adapter.Wrappers;
+
+public class WorldObjectCollection : GenericDisposableWrapper<WorldIterator>, IEnumerable<WorldObject>, IEnumerable
+{
+	public class Iterator : IEnumerator<WorldObject>, IDisposable, IEnumerator
+	{
+		private WorldObjectCollection collection;
+
+		private WorldObject current;
+
+		public WorldObject Current
+		{
+			get
+			{
+				if (current == null)
+				{
+					MoveNext();
+				}
+				return current;
+			}
+		}
+
+		object IEnumerator.Current
+		{
+			get
+			{
+				if (current == null)
+				{
+					MoveNext();
+				}
+				return current;
+			}
+		}
+
+		internal Iterator(WorldObjectCollection collection)
+		{
+			this.collection = collection;
+			Reset();
+		}
+
+		public void Dispose()
+		{
+			collection = null;
+		}
+
+		public bool MoveNext()
+		{
+			Decal.Interop.Filters.WorldObject ppObject = null;
+			bool num = collection.Wrapped.Next(ref ppObject);
+			if (num && ppObject != null)
+			{
+				current = collection.wf.GetCachedWorldObject(ppObject);
+			}
+			return num;
+		}
+
+		public void Reset()
+		{
+			collection.Wrapped.Reset();
+		}
+	}
+
+	private WorldObject current;
+
+	private WorldFilter wf;
+
+	private IEnumerator<WorldObject> myEnum;
+
+	public int Count => base.Wrapped.Count;
+
+	public int Quantity => base.Wrapped.Quantity;
+
+	public WorldObject First
+	{
+		get
+		{
+			using IEnumerator<WorldObject> enumerator = GetEnumerator();
+			return enumerator.Current;
+		}
+	}
+
+	[Obsolete("Use Enumerators")]
+	[EditorBrowsable(EditorBrowsableState.Never)]
+	public WorldObject Current
+	{
+		get
+		{
+			if (myEnum == null)
+			{
+				myEnum = GetEnumerator();
+			}
+			return myEnum.Current;
+		}
+	}
+
+	internal WorldObjectCollection(WorldFilter wf, WorldIterator obj)
+		: base(obj)
+	{
+		this.wf = wf;
+	}
+
+	public void SetFilter(WorldObjectCollectionFilter filter)
+	{
+		filter?.ApplyFilter(base.Wrapped);
+	}
+
+	protected override void Dispose(bool userCalled)
+	{
+		if (myEnum != null)
+		{
+			myEnum.Dispose();
+			myEnum = null;
+		}
+		base.Dispose(userCalled);
+	}
+
+	[Obsolete("Use Enumerators")]
+	[EditorBrowsable(EditorBrowsableState.Never)]
+	public bool MoveNext()
+	{
+		if (myEnum == null)
+		{
+			myEnum = GetEnumerator();
+		}
+		return myEnum.MoveNext();
+	}
+
+	[Obsolete("Use Enumerators")]
+	[EditorBrowsable(EditorBrowsableState.Never)]
+	public void Reset()
+	{
+		if (myEnum != null)
+		{
+			myEnum.Dispose();
+			myEnum = null;
+		}
+	}
+
+	public IEnumerator<WorldObject> GetEnumerator()
+	{
+		return new Iterator(this);
+	}
+
+	IEnumerator IEnumerable.GetEnumerator()
+	{
+		return new Iterator(this);
+	}
+}