* [rcore] add 'GetClipboardImage' for windows
* [rcore] GetClipboardImage removed some unneeded defines
* [rcore] PLATFORM_SDL: create a compatility layer for SDL3
* external: add win32_clipboard.h header only lib
* [rcore] using win32_clipboard on platforms rlfw and rgfw
* [rcore] fix warnings in SDL3 compatibility layer
* Makefile: Allow specifying SDL_LIBRARIES to link, this helps with SDL3
* Makefile: examples makefile now compile others/rlgl_standalone only when TARGET_PLATFORM is PLATFORM_DESKTOP_GFLW
* Makefile: examples makefile now compile others/rlgl_standalone only when TARGET_PLATFORM is PLATFORM_DESKTOP_GFLW
* [rcore]: PLATFORM_SDL: improve clipboard data retrieval
* external: remove unused function from win32_clipboard.h
* Makefile: allow for extra flags necessary when compiling for SDL3
* [rcore]: fix string typo
* [rcore]: Properly handle NULL dpi passing. As is allowed in SDL2
* external: fix arch finding on win32_clipboard.h to allow compilation on msvc cmake CI
* [rcore]: PLATFORM_SDL: Treat monitor as an ID in SDL3 as opposed to an index as in SDL2
* [rcore]: typo
