XDG Base Directory Specification

A list of software (not) adhering to this specification is maintained in the Arch Linux wiki: https://wiki.archlinux.org/index.php/XDG_Base_Directory

Too little, too late, *nix filesystem directory structure is a legacy mess and plenty program not respecting the xdg spec, so the poor HaikuPorters needs to patch everything to stop littering the $HOME folder.