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/DecalControls/CheckColumn.cpp

@@ -0,0 +1,114 @@
+// CheckColumn.cpp : Implementation of cCheckColumn
+#include "stdafx.h"
+#include "DecalControls.h"
+#include "CheckColumn.h"
+
+/////////////////////////////////////////////////////////////////////////////
+// cCheckColumn
+
+STDMETHODIMP cCheckColumn::get_FixedWidth(VARIANT_BOOL *pVal)
+{
+   *pVal = VARIANT_TRUE;
+
+	return S_OK;
+}
+
+STDMETHODIMP cCheckColumn::get_Width(long *pVal)
+{
+   *pVal = 20;
+
+	return S_OK;
+}
+
+STDMETHODIMP cCheckColumn::put_Width(long newVal)
+{
+//	m_Width = newVal;
+
+	return S_OK;
+}
+
+STDMETHODIMP cCheckColumn::Render(ICanvas *pCanvas, LPPOINT ptCell, long nColor)
+{
+	_variant_t vCheck, vHidden;
+	bool bHidden, bCheck;
+
+	m_pList->get_Data( ptCell->x, ptCell->y, 0, &vCheck );
+	bCheck = vCheck.vt == VT_NULL ? false : static_cast<bool>(vCheck);
+
+	m_pList->get_Data( ptCell->x, ptCell->y, 1, &vHidden );
+	bHidden = vHidden.vt == VT_NULL ? false : static_cast<bool>(vHidden);
+
+	// Converted nicely now ...
+	// Find our checked and unchecked images
+	CComPtr< IIconCache > pIcons;
+
+	SIZE sz = { 13, 13 };
+	m_pSite->GetIconCache( &sz, &pIcons );
+
+	POINT pt = { 3, 3 };
+	if( !bHidden )
+		pIcons->DrawIcon( &pt, bCheck ? 0x0600128B : 0x0600128D, 0, pCanvas );
+
+	return S_OK;
+}
+
+STDMETHODIMP cCheckColumn::get_DataColumns(long *pVal)
+{
+   *pVal = 2;
+
+	return S_OK;
+}
+
+STDMETHODIMP cCheckColumn::Initialize(IList *newVal, IPluginSite *pSite)
+{
+   m_pList = newVal;
+   m_pSite = pSite;
+
+	return S_OK;
+}
+
+STDMETHODIMP cCheckColumn::SchemaLoad(IUnknown *pSchema)
+{
+	// TODO: Add your implementation code here
+
+	return S_OK;
+}
+
+STDMETHODIMP cCheckColumn::get_Height(long *pVal)
+{
+   *pVal = 20;
+
+	return S_OK;
+}
+
+STDMETHODIMP cCheckColumn::Activate(LPPOINT ptCell)
+{
+	_variant_t vCheck, vHidden;
+
+	bool bHidden, bCheck;
+
+	m_pList->get_Data( ptCell->x, ptCell->y, 0, &vCheck );
+	bCheck = vCheck.vt == VT_NULL ? false : static_cast<bool>(vCheck);
+
+	m_pList->get_Data( ptCell->x, ptCell->y, 1, &vHidden );
+	bHidden = vHidden.vt == VT_NULL ? false : static_cast<bool>(vHidden);
+
+	if( !bHidden )
+		m_pList->put_Data( ptCell->x, ptCell->y, 0, &_variant_t( !bCheck ) );
+
+	return S_OK;
+}
+
+STDMETHODIMP cCheckColumn::get_Color(long nRow, long *pVal)
+{
+	// TODO: Add your implementation code here
+
+	return S_OK;
+}
+
+STDMETHODIMP cCheckColumn::put_Color(long nRow, long newVal)
+{
+	// TODO: Add your implementation code here
+
+	return S_OK;
+}