Notification on passthrough enabling if hardware not connected
Fix for default arguments in constructor again.
Split apart vc passthrough and aux.
Fix mixxxkeyboard so it clears its list if a dialog is shown by Mixxx.
Add a qDebug() operator<< for ConfigKeys!
Merge branch 'master' into passthrough_notification
rename variable
Merge pull request #211 from ywwg/passthrough_notification

Notification on passthrough enabling if hardware not connected