Revert "Revert to pre-release status due to some trouble with PsychoPy > 1.80.02"

This reverts commit ca28fc20b051606fda6101fe580dcfdb0a7865b8.
Merge branch 'playground' of github.com:smathot/OpenSesame into playground
- Update debian/changelog
Bump to 2.8.2~pre7
Fix a translation bug for non-ASCII str objects
Add first version of Quest staircase plug-ins
Add Quest staircase example
Fall back to saving the logfile to a temporary folder when doing a quick run
Update debian/changelog