This reverts commit 4f6fbaed41.

Specifically, std.fs.OpenDirOptions struct no longer has the iterable
flag, now it's a standalone function call std.fs.openIterableDir

Co-authored-by: Nikolai Krasheninnikov <nikolai.krasheninnikov@kronshtadt.ru>

Moved to raudio library repo: https://github.com/raysan5/raudio

Those functions were platform dependent and user has no control over the file created. They have been removed from raylib and just moved to `core_storage_values` example.

This example requires a complete remake to be more clear. Also current quaternion maths could have issues.