heilerich/neurone_loader: Version 1.1.6

Bugfix: Reproducible ordering of sessions

⚠️ Session loading uses os.listdir to find sessions. This function does not guarantee any specific order, which might lead to inconsistencies between systems or even runs on the same system. Sessions are now ordered chronological, i.e. according to their start time, which is probably what most users expect.

Maintenance: Tests were migrated from Travis to GitHub Actions