Adds more filters for conditional build of GetWindowHandle with glfw

This reverts commit bab234a1604a9d23538594bd3894bf13574612df, reversing
changes made to 13e384ce71.

There was a typo in the generated keycode.

hope this gets merged

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.