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/PluginHost.cs

@@ -0,0 +1,149 @@
+using System;
+using System.ComponentModel;
+using System.IO;
+using System.Reflection;
+using System.Runtime.InteropServices;
+using System.Xml;
+using Decal.Interop.Core;
+using Decal.Interop.Inject;
+using Decal.Interop.Render;
+
+namespace Decal.Adapter.Wrappers;
+
+[CLSCompliant(true)]
+public sealed class PluginHost : HostBase
+{
+	private IPluginSite2 mySite;
+
+	private IPluginSite myOldSite;
+
+	[CLSCompliant(false)]
+	[EditorBrowsable(EditorBrowsableState.Never)]
+	public IPluginSite2 Underlying => mySite;
+
+	public DecalWrapper Decal
+	{
+		get
+		{
+			if (base.MyDecal == null)
+			{
+				base.MyDecal = new DecalWrapper(mySite.Decal);
+			}
+			return base.MyDecal;
+		}
+	}
+
+	public HooksWrapper Actions => CoreManager.Current.Actions;
+
+	public RenderServiceWrapper Render
+	{
+		get
+		{
+			if (base.MyRender == null)
+			{
+				base.MyRender = new RenderServiceWrapper((RenderService)GetObject("services\\DecalRender.RenderService"));
+			}
+			return base.MyRender;
+		}
+	}
+
+	internal PluginHost(PluginSite2 pSite)
+	{
+		mySite = pSite;
+		base.MyDecal = new DecalWrapper(mySite.Decal);
+		myOldSite = (IPluginSite)mySite.PluginSite;
+	}
+
+	protected override void Dispose(bool disposing)
+	{
+		try
+		{
+			_ = base.IsDisposed;
+			if (myOldSite != null)
+			{
+				Marshal.ReleaseComObject(myOldSite);
+				myOldSite = null;
+			}
+			if (mySite != null)
+			{
+				Marshal.ReleaseComObject(mySite);
+				mySite = null;
+			}
+		}
+		finally
+		{
+			base.Dispose(disposing);
+		}
+	}
+
+	public object GetObject(string path)
+	{
+		return ((dynamic)mySite).get_Object(path);
+	}
+
+	public int GetKeyboardMapping(string name)
+	{
+		return myOldSite.QueryKeyboardMap(name);
+	}
+
+	internal static void LoadViewHandler(IViewHandler handler)
+	{
+		if (ViewWrapper.ScanViews(handler))
+		{
+			ViewWrapper.ScanControls(handler);
+			ViewWrapper.ScanReferences(handler);
+		}
+	}
+
+	public ViewHandler LoadViewHandler(Type handlerType)
+	{
+		ViewHandler obj = (ViewHandler)Activator.CreateInstance(handlerType, this);
+		LoadViewHandler(obj);
+		obj.LoadComplete();
+		return obj;
+	}
+
+	public ViewWrapper LoadViewResource(string resourcePath)
+	{
+		Assembly callingAssembly = Assembly.GetCallingAssembly();
+		return LoadViewResource(resourcePath, callingAssembly);
+	}
+
+	public ViewWrapper LoadViewResource(string resourcePath, Assembly resourceAssembly)
+	{
+		//IL_001c: Unknown result type (might be due to invalid IL or missing references)
+		//IL_0022: Expected O, but got Unknown
+		if (null == resourceAssembly)
+		{
+			throw new ArgumentNullException("resourceAssembly");
+		}
+		Stream manifestResourceStream = resourceAssembly.GetManifestResourceStream(resourcePath);
+		XmlDocument val = new XmlDocument();
+		val.Load(manifestResourceStream);
+		return LoadView(((XmlNode)val).OuterXml);
+	}
+
+	public ViewWrapper LoadView(XmlElement viewSchema)
+	{
+		if (viewSchema == null)
+		{
+			throw new ArgumentNullException("viewSchema");
+		}
+		return LoadView(((XmlNode)viewSchema).OuterXml);
+	}
+
+	public ViewWrapper LoadView(string viewSchema)
+	{
+		View view = myOldSite.LoadView(viewSchema);
+		if (view != null)
+		{
+			return new ViewWrapper(view);
+		}
+		return null;
+	}
+
+	public object ComFilter(string progId)
+	{
+		return ((dynamic)mySite).get_Object("services\\DecalNet.NetService\\" + progId);
+	}
+}