add `IO::MoveFolder`

[ezio416]

Maybe this could instead be IO::Rename that could work for files and folders, but I think MoveFolder would be more consistent with existing functions

[codecat]

The following code works for me:

auto path = IO::FromStorageFolder("Test");
auto newPath = IO::FromStorageFolder("Test_Moved");

IO::CreateFolder(path);
{
    IO::File f(path + "/test.txt", IO::FileMode::Write);
    f.WriteLine("Hello world");
}
IO::Move(path, newPath);

I did however change IO::Move to use MOVEFILE_WRITE_THROUGH, but that shouldn't matter too much if you're not immediately observing the directory.

[ezio416]

This snippet does work, my bad. I made the issue based on the discord convo but hadn't actually tested it myself.