Consider placing application data to a more appropriate path on linuxes

[Romain DEP.]

This would consist of merging https://bitbucket.org/rom1dep/babbler/commits/branch/linuxPath / cherry picking https://bitbucket.org/rom1dep/babbler/commits/1e3ec687eb71bdf72eea759742797965e3ba5904

It’s quite unusual (and annoying) for apps to place things at the root of the home directory. This aligns with the general practice that is to use ~/.config

[Christian Schudt]

Thanks for this! Cherry-picked it into master branch.

[Romain DEP.]

committed to master