Add backwards-compatibile QByteArray for pre 5.7 builds
Add backwards-compatibile QByteArray for pre 5.7 builds

docsteer/sacnview,marcusbirkin/sacnview,marcusbirkin/sacnview,docsteer/sacnview,marcusbirkin/sacnview,docsteer/sacnview,marcusbirkin/sacnview,docsteer/sacnview,marcusbirkin/sacnview,docsteer/sacnview,docsteer/sacnview,marcusbirkin/sacnview,docsteer/sacnview,marcusbirkin/sacnview