Introduce a config option for the Crane directory location

[Etenil]

On Linux, Crane creates a Crane directory in the user's folder where it stores its (indexing?) data. Because this isn't a hidden folder and its location cannot be changed, it is both surprising and possibly undesirable.

Please add a configuration option to move it elsewhere, or just change it to be a hidden folder .Crane.

Thanks

[TheColorRed]

I have introduced this in PR #181.

It will place the directory at: $HOME/.Crane. When this becomes available you can either rename the directory, or just delete it and let crane do its thing to rebuild stuff upon request.

[MelleB]

Please don't litter users' home folder with an extra config file.
It's good convention to use he $XDG_CONFIG_HOME and $XDG_DATA_HOME variables for linux users (not sure about mac users?).
For more info see https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
Other interesting discussion: microsoft/vscode#3884

[ichiriac]

Cross platform command would be require('os').homedir() / see https://nodejs.org/api/os.html#os_os_homedir

Also would be cool if the name of crane directory would be prefixed with a point, .crane as it would be masked and considered as a system folder on many OS.

[MelleB]

@ichiriac I think it'd be better to use https://www.npmjs.com/package/xdg