2V0-g: port the .fnt font pipeline over a FreeType GDI emulation

CGraphicText, CGraphicFontTexture and CGraphicDib are the 40250 bodies
verbatim; CGraphicTextInstance is verbatim except that its D3D draws become
UI render commands (one image quad per glyph, Bar for cursor/underline).

- platform/Win32Gdi.cpp: the GDI subset those files call, over vendored
  FreeType 2.13.3, following GDI's LOGFONT cell height, win metrics and gasp
  rules; system font lookup with substitute and CJK fallback faces
- Win32Crt: MultiByteToWideChar / WideCharToMultiByte (UTF-8 and 1252 by
  hand, other code pages through iconv)
- CGraphicImageTexture memory textures: glyph pages reach Godot as
  "mem:<id>@<revision>"; Metin2PythonHost.memory_texture + Canvas cache
- Util.cpp code page / font face table, SetDefaultCodePage at boot,
  DefaultFont_* block, fnt resource type, GetMaxTextureWidth/Height
- TextTag, StringCodec, Arabic, Vietnamese copied from 40250
- tests: port.text (Tahoma 12 metrics, alignment, CP949), port.app_loop
  and python_host_test.gd now check glyph quads instead of text commands

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

extension/src/platform/EterLib/GrpDIB.cpp

@@ -1,71 +1,115 @@
-// Platform skeleton for EterLib/GrpDIB.h (40250 EterLib/GrpDIB.cpp), generated by platform_stub.py.
-// Every MT_PLATFORM_STUB() body is unimplemented: replace it with the platform implementation.
+// 40250 EterLib/GrpDIB.cpp, verbatim. The GDI calls are the FreeType-backed platform/Win32Gdi.cpp.
 #include "EterLib/StdAfx.h"
 #include "EterLib/GrpDIB.h"
 
-#include "../PlatformStub.h"
-
 CGraphicDib::CGraphicDib()
 {
-	MT_PLATFORM_STUB();
+	Initialize();
 }
 
 CGraphicDib::~CGraphicDib()
 {
-	MT_PLATFORM_STUB();
+	Destroy();
 }
 
-auto CGraphicDib::Destroy() -> void
+void CGraphicDib::Initialize()
 {
-	MT_PLATFORM_STUB();
+	m_hDC=NULL;
+	m_hBmp=NULL;
+	m_pvBuf=NULL;
+	m_width=0;
+	m_height=0;
 }
 
-auto CGraphicDib::Create(HDC, int, int) -> bool
-{
-	MT_PLATFORM_STUB();
-	return mt_platform_stub_return<bool>();
+void CGraphicDib::Destroy()
+{			
+	if (m_hBmp) DeleteObject(m_hBmp);			
+	if (m_hDC)	DeleteDC(m_hDC);
+	
+	Initialize();			
 }
 
-auto CGraphicDib::SetBkMode(int) -> void
+bool CGraphicDib::Create(HDC hDC, int width, int height)
 {
-	MT_PLATFORM_STUB();
+	Destroy();
+
+	m_width = width;
+	m_height = height;
+
+	ZeroMemory(&m_bmi.bmiHeader,  sizeof(BITMAPINFOHEADER));
+	m_bmi.bmiHeader.biSize        = sizeof(BITMAPINFOHEADER);
+	m_bmi.bmiHeader.biWidth       =  m_width;
+	m_bmi.bmiHeader.biHeight      = -m_height;
+	m_bmi.bmiHeader.biPlanes      = 1;			
+	m_bmi.bmiHeader.biBitCount    = 32;
+	m_bmi.bmiHeader.biCompression = BI_RGB;
+
+	m_hDC=CreateCompatibleDC(hDC);
+	if (!m_hDC)
+	{
+		assert(!"CGraphicDib::Create CreateCompatibleDC Error");
+		return false;
+	}
+
+	m_hBmp=CreateDIBSection(m_hDC, &m_bmi, DIB_RGB_COLORS, &m_pvBuf, NULL, 0);
+	if (!m_hBmp)
+	{
+		assert(!"CGraphicDib::Create CreateDIBSection Error");
+		return false;
+	}
+
+	SelectObject(m_hDC, m_hBmp);
+
+	::SetTextColor(m_hDC, RGB(255, 255, 255));
+
+	return true;
 }
 
-auto CGraphicDib::TextOut(int, int, const char *) -> void
+HDC	CGraphicDib::GetDCHandle()
 {
-	MT_PLATFORM_STUB();
+	return m_hDC;
 }
 
-auto CGraphicDib::Put(HDC, int, int) -> void
+void CGraphicDib::SetBkMode(int iBkMode)
 {
-	MT_PLATFORM_STUB();
+	::SetBkMode(m_hDC, iBkMode);
 }
 
-auto CGraphicDib::GetWidth() -> int
+void CGraphicDib::TextOut(int ix, int iy, const char * c_szText)
 {
-	MT_PLATFORM_STUB();
-	return mt_platform_stub_return<int>();
+	::SetBkColor(m_hDC, 0);	
+	::TextOut(m_hDC, ix, iy, c_szText, strlen(c_szText));
 }
 
-auto CGraphicDib::GetHeight() -> int
+void CGraphicDib::Put(HDC hDC, int x, int y)
 {
-	MT_PLATFORM_STUB();
-	return mt_platform_stub_return<int>();
+	SetDIBitsToDevice(
+	  hDC,     
+	  x,       
+	  y,       
+	  m_width, 
+	  m_height,
+	  0,
+	  0,
+	  0,
+	  m_height,
+	  m_pvBuf,
+	  &m_bmi,
+	  DIB_RGB_COLORS
+	);
 }
 
-auto CGraphicDib::GetPointer() -> void *
+void* CGraphicDib::GetPointer()
 {
-	MT_PLATFORM_STUB();
-	return mt_platform_stub_return<void *>();
+	return m_pvBuf;
 }
 
-auto CGraphicDib::GetDCHandle() -> HDC
+int CGraphicDib::GetWidth()
 {
-	MT_PLATFORM_STUB();
-	return mt_platform_stub_return<HDC>();
+	return m_width;
 }
 
-auto CGraphicDib::Initialize() -> void
+int CGraphicDib::GetHeight()
 {
-	MT_PLATFORM_STUB();
+	return m_height;
 }