Follow XDG Base Directory Specification

[yudai-nkt]

I'm currently reorganizing my dotfiles in a way more compliant to the XDG Base Directory Specification to make my home directory less cluttered. Many softwares including latexmk follow this specification and I'd be glad if DiCy joins the party.

In that case, $XDG_CONFIG_HOME/dicy/dicy.yaml will be read instead of ~/.dicy.yaml (file name might be change at this point as the dicy subdirectory explicitly describes the YAML file is about DiCy). If $XDG_CONFIG_HOME is unset or empty, it should be replaced with $HOME/.config. The YAML file in user's home directory can still be used and whether or not to keep backward-compatibility is entirely up to you of course.

[yitzchak]

Thanks for the suggestion. I'll look into it.

[yitzchak]

@yudai-nkt #139 should accomplish this. I'll merge it eventually, but it may be a while before it's released since I working on a large update.