QT < 5.8 fix
QT < 5.8 fix

Q_FALLTHROUGH was introduced in QT 5.8
marcusbirkin/sacnview,marcusbirkin/sacnview,marcusbirkin/sacnview,docsteer/sacnview,docsteer/sacnview,marcusbirkin/sacnview,docsteer/sacnview,docsteer/sacnview,docsteer/sacnview,marcusbirkin/sacnview,docsteer/sacnview,docsteer/sacnview,marcusbirkin/sacnview,marcusbirkin/sacnview