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/DecalSupportLibraries/Attic/ReadMe.txt

@@ -0,0 +1,105 @@
+================================================================================
+    MICROSOFT FOUNDATION CLASS LIBRARY : DecalSupportLibraries Project Overview
+===============================================================================
+
+The application wizard has created this DecalSupportLibraries application for 
+you.  This application not only demonstrates the basics of using the Microsoft 
+Foundation Classes but is also a starting point for writing your application.
+
+This file contains a summary of what you will find in each of the files that
+make up your DecalSupportLibraries application.
+
+DecalSupportLibraries.vcproj
+    This is the main project file for VC++ projects generated using an application wizard. 
+    It contains information about the version of Visual C++ that generated the file, and 
+    information about the platforms, configurations, and project features selected with the
+    application wizard.
+
+DecalSupportLibraries.h
+    This is the main header file for the application.  It includes other
+    project specific headers (including Resource.h) and declares the
+    CDecalSupportLibrariesApp application class.
+
+DecalSupportLibraries.cpp
+    This is the main application source file that contains the application
+    class CDecalSupportLibrariesApp.
+
+DecalSupportLibraries.rc
+    This is a listing of all of the Microsoft Windows resources that the
+    program uses.  It includes the icons, bitmaps, and cursors that are stored
+    in the RES subdirectory.  This file can be directly edited in Microsoft
+    Visual C++. Your project resources are in 1033.
+
+res\DecalSupportLibraries.ico
+    This is an icon file, which is used as the application's icon.  This
+    icon is included by the main resource file DecalSupportLibraries.rc.
+
+res\DecalSupportLibraries.rc2
+    This file contains resources that are not edited by Microsoft 
+    Visual C++. You should place all resources not editable by
+    the resource editor in this file.
+DecalSupportLibraries.reg
+    This is an example .reg file that shows you the kind of registration
+    settings the framework will set for you.  You can use this as a .reg
+    file to go along with your application.
+DecalSupportLibraries.idl
+    This file contains the Interface Description Language source code for the
+    type library of your application.
+
+/////////////////////////////////////////////////////////////////////////////
+
+The application wizard creates one dialog class and automation proxy class:
+DecalSupportLibrariesDlg.h, DecalSupportLibrariesDlg.cpp - the dialog
+    These files contain your CDecalSupportLibrariesDlg class.  This class defines
+    the behavior of your application's main dialog.  The dialog's template is
+    in DecalSupportLibraries.rc, which can be edited in Microsoft Visual C++.
+DlgProxy.h, DlgProxy.cpp - the automation object
+    These files contain your CDecalSupportLibrariesDlgAutoProxy class.  This class
+    is called the Automation proxy class for your dialog, because it
+    takes care of exposing the Automation methods and properties that
+    Automation controllers can use to access your dialog.  These methods
+    and properties are not exposed from the dialog class directly, because
+    in the case of a modal dialog-based MFC application it is cleaner and
+    easier to keep the Automation object separate from the user interface.
+/////////////////////////////////////////////////////////////////////////////
+
+Other Features:
+
+ActiveX Controls
+    The application includes support to use ActiveX controls.
+/////////////////////////////////////////////////////////////////////////////
+
+Other standard files:
+
+StdAfx.h, StdAfx.cpp
+    These files are used to build a precompiled header (PCH) file
+    named DecalSupportLibraries.pch and a precompiled types file named StdAfx.obj.
+
+Resource.h
+    This is the standard header file, which defines new resource IDs.
+    Microsoft Visual C++ reads and updates this file.
+
+DecalSupportLibraries.manifest
+	Application manifest files are used by Windows XP to describe an applications 
+	dependency on specific versions of Side-by-Side assemblies. The loader uses this 
+	information to load the appropriate assembly from the assembly cache or private 
+	from the application. The Application manifest  maybe included for redistribution 
+	as an external .manifest file that is installed in the same folder as the application 
+	executable or it may be included in the executable in the form of a resource. 
+/////////////////////////////////////////////////////////////////////////////
+
+Other notes:
+
+The application wizard uses "TODO:" to indicate parts of the source code you
+should add to or customize.
+
+If your application uses MFC in a shared DLL, and your application is in a 
+language other than the operating system's current language, you will need 
+to copy the corresponding localized resources MFC70XXX.DLL from the Microsoft
+Visual C++ CD-ROM under the Win\System directory to your computer's system or 
+system32 directory, and rename it to be MFCLOC.DLL.  ("XXX" stands for the 
+language abbreviation.  For example, MFC70DEU.DLL contains resources 
+translated to German.)  If you don't do this, some of the UI elements of 
+your application will remain in the language of the operating system.
+
+/////////////////////////////////////////////////////////////////////////////