Customize `~/.choosenim` directory

[hyperupcall]

Hai,

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?

Thankies, Edwin