Customize the config location and default to XDG_CONFIG_HOME

[jcrben]

I would prefer to get the scattered configs out of my home directory and into a central directory (I prefer ~/.config). dinghy is one of the few left - it is possible to customize where the preferences are installed? My preference would be to use the XDG_CONFIG_HOME if set, even on OSX...

[codekitchen]

It's hard-coded right now, but I don't see any particular problem with adding support for XDG_CONFIG_HOME if you want to send over a PR. Right now ~/.dinghy has both config and data files in it, so I suppose technically it should be using XDG_DATA_HOME as well to really follow the standard outlined at https://specifications.freedesktop.org/basedir-spec/latest/index.html#introduction

We'd want migration code as well, to look in ~/.dinghy and move files over if XDG_CONFIG_HOME is defined, so that dinghy doesn't mysterious reset itself when somebody upgrades.