Customize `~/.choosenim` directory
Hello! I think it would be great to have the ability to customize the `~/.choosenim` directory location. I'd rather put it in a place like `~/.local/share/choosenim` to declutter my home directory. Is there any interest in this feature? I would go further and mention XDG Base Directory compliance, ~~but I think having some variable like `CHOOSENIM_ROOT` is an easy and quick fix~~, but use `~/.choosenim` if it already exists for backwards-compatibility. (I would also add that the `--nimbleDir` argument is good, but will not always take effect for some scripts and the exec family of syscalls). Is there any interest in this?

Thanks,
Edwin