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/Inject/HookedFunctions.cpp

@@ -0,0 +1,104 @@
+extern void (*pfnOldChatMessage)(char*, unsigned long);
+extern void (*pfnOldChatText)(void);
+
+bool DispatchChatMessage ( char *pText, long *pdwColor );
+bool DispatchChatText ( char *pText );
+
+void __declspec(naked) OnChatMessage(char* pText, long dwColor)
+{
+/*	__asm
+	{
+		//int 3
+
+		push ecx
+		push esi
+		
+		lea esi, dwColor
+		push esi
+		push pText
+		call DispatchChatMessage
+
+		// Pop the two arguments
+		add esp, 8
+
+		test al, al
+		jz dont_kill_text
+
+		mov esi, pText
+		mov BYTE PTR [esi], 0
+
+dont_kill_text:
+		pop esi
+		pop ecx
+
+		jmp pfnOldChatMessage
+	}*/
+
+	__asm
+	{
+		push    ebp
+		mov     ebp, esp
+		sub     esp, 20h
+		push	esi
+
+		push	ecx
+
+		lea		esi, dwColor
+		push	esi
+		push	pText
+		call	DispatchChatMessage
+		
+		add		esp, 8
+
+		test	al, al
+		jz		dont_kill_text
+
+		mov		DWORD PTR [pText], 0
+
+dont_kill_text:
+
+		pop		ecx
+
+		push	dwColor
+		push	pText
+		call	pfnOldChatMessage
+
+		pop     esi
+		mov     esp, ebp
+		pop     ebp
+		retn    8
+	}
+}
+
+void __declspec(naked) OnChatText()
+{
+	__asm
+	{
+		push ebp
+		mov ebp, esp
+		sub esp, 0xC
+
+		call pfnOldChatText
+
+		mov [ebp-4], ecx
+		mov [ebp-8], eax
+
+		push eax
+
+		call DispatchChatText
+
+		mov edx, eax
+		mov ecx, [ebp-4]
+		mov eax, [ebp-8]
+
+		test dl, dl
+		jz dont_eat_chat_text
+
+		mov BYTE PTR [eax], 0
+
+dont_eat_chat_text:
+		mov esp, ebp
+		pop ebp
+		ret
+	}
+}