[rcore][drm] Replace DRM swap buffer implementation with asynchronous page-flipping and triple framebuffer caching

[rlgl] Add rlGetProcAddress

Fixed: CMake support for SDL3

[rl_gputex] fix: decouple logging and memory allocation from Raylib

Added CMake support for SDL3.
Now supports including SDL2 or SDL3 as a subdirectory within the project. The system will first check for SDL3, then SDL2. If neither is found, it will attempt find_package(SDL3), followed by find_package(SDL2). If all these checks fail, the process will terminate with an error.

[build][zig] use `addLibrary()` and set root modules manually

These changes will be required by Zig version 0.15.0.

[examples]: New example: `shapes_double_pendulum`

[rcore][linux] Fixes GetWindowHandle returning a bad handle under Linux X11

[build] Update Makefile

Remove .bc file removal from clean shell for windows configuration.

Update font load message

[example][web] Fix core_custom_frame_control.c to properly register inputs on web platform

[raudio] Fix: music stopping early. Fix: GetMusicTimePlayed for short music

[rtextures] Fix ImageColorReplace() alpha issue replacement

Clean up library build for the web

Fix warning log macro in rlgl

[raudio] Prevent UpdateMusicStream to run without music playing

[rtextures] Fix HalfToFloat Mantissa hex value

- make sure that src/external/rl_gputex.h uses it's own macros
    for printing warnings and allocating memory
- add few additional macros in order to decouple rl_gputex from headers
    that are being included by Raylib (e.g. *_MEMSET, *_NULL and so on)
- make sure that rl_gputex uses RL_*ALLOC, TRACELOG and RLAPI macros
    when (and only when) being included by src/rtextures.c
- replace LOG() and RL_GPUTEX_SHOW_LOG_INFO macros with: RL_GPUTEX_WARN
    and RL_GPUTEX_SHOW_WARN_INFO (this is a breaking change, but it was
    broken and unusable anyway, see:
    https://github.com/raysan5/raylib/issues/5039#issuecomment-3065732596 )
- fixes issue all issues mentioned in:
    https://github.com/raysan5/raylib/issues/5039#issuecomment-3065732596
- remove logging upon successfully saving a file; Raylib does this
    anyway and we want rl_gputex to only print WARNings upon failures;
    see: https://discord.com/channels/426912293134270465/541710686468702250/1394406734306480352
- add additional condition when saving a file; now checks for both
    fwrite() and fclose() failures; before it would warn about both,
    but only return result based on fclose()
- add some notes about the current state of compiling rl_gputex
    without depending on Raylib (spoiler: it's still broken...)
- bump rl_gputex version to 1.1 since this is a potential breaking
    change (only for people attempting to use it without Raylib)

Fixes: https://github.com/raysan5/raylib/issues/5039
Reference: https://discord.com/channels/426912293134270465/541710686468702250/1394403611852931255

[rtextures] Fix `ImageDrawLineEx()` line thickness

[rtextures] fix integer overflow in cast for `ImageBlurGaussian`