install-path XDG

[Gankra]

There should be a way to tell install-path to try to use XDG dirs (quick skimming suggests that just means $HOME/.local/bin?). What exactly that means on windows is contentious, but if we have #286 we can just say "this doesn't make sense on windows" and ignore it in the cascade.

[konstin]

I would like to ask to change the default to $HOME/.local/bin. Most tools written in rust aren't cargo tools, they are either standalone or tools for other languages (i for example write python tooling, where it is strange when it's in a cargo folder). The other advantage is that avoids editing the user dotfiles. From https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html:

User-specific executable files may be stored in $HOME/.local/bin. Distributions should ensure this directory shows up in the UNIX $PATH environment variable, at an appropriate place.

I don't know enough about windows to say what should be done there.