Port Window.c and crt.c from SDL2 to SDL3

[Grosama]

Changes in Window.c and crt.c:

• Replace SDL_WINDOW_FULLSCREEN_DESKTOP with SDL_WINDOW_FULLSCREEN
• Replace SDL_CreateWindow signature (removed x/y position params)
• Replace SDL_CreateRenderer (removed index and flags params)
• Add SDL_SetRenderVSync for vsync control
• Replace SDL_RenderCopy with SDL_RenderTexture
• Replace SDL_ShowCursor with SDL_HideCursor
• Replace SDL_PRESSED/SDL_RELEASED with bool down in events
• Replace SDL_QUIT/SDL_KEYDOWN etc with SDL_EVENT_* equivalents
• Replace keysym.sym/mod with key/mod in SDL_KeyboardEvent
• Replace SDL_JoystickGetAttached with SDL_JoystickConnected
• Replace SDL_JoystickClose with SDL_CloseJoystick
• Replace SDL_NumJoysticks with SDL_HasJoystick
• Replace SDL_QueryTexture with SDL_GetTextureSize
• Replace SDL_CreateRGBSurface with SDL_CreateSurface
• Replace SDL_HINT_RENDER_SCALE_QUALITY with SDL_SetTextureScaleMode
• Fix SDL_Init return type (bool in SDL3)
• Use SDL_FRect instead of SDL_Rect for render destination

Tested on Windows with MSYS2 MinGW64 toolchain and SDL3 3.4.2.
Note: CMakeLists.txt may need adjustments depending on how SDL3 is installed on your platform.

[daltomi]

Thanks for the PR.
A quick test, just out of curiosity, how SDL3 works on my hardware, without any compiler flag changes or anything.
I don't know any other way to test so I used the program that Tilengine comes with: ./benchmark
I didn't have to adjust anything for CMake, it works perfect.

On my low-end hardware.

gcc (GCC) 15.2.1 20260209 
Artix Linux - Kernel 7.0.0-x64v3-xanmod1
Mesa 1:26.0.5-1 
AMD Ryzen 3 3200G with Radeon Vega Graphics (Integrated graphics)

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Edit:

WYSIWYG, IANARS ICUDK
My test is useless.
I have the sdl2-compat package installed, which uses the SDL3 library behind the scenes.

Arch Linux replaced their SDL2 package with sdl2-compat
LOL