Add a new connection type - Lawicel. It works for some devices, not

all. More development needed but this is a start. Also added ability
to set serial speed and bus speed in the device setup which may be
useful for other connection devices too.

connections/canconnectionmodel.cpp

@@ -86,6 +86,7 @@ QVariant CANConnectionModel::data(const QModelIndex &index, int role) const
                         case CANCon::SERIALBUS: return "SerialBus";
                         case CANCon::GVRET_SERIAL: return "GVRET";
                         case CANCon::KAYAK: return "socketcand";
+                        case CANCon::LAWICEL: return "LAWICEL";
                         default: {}
                     }
                 else qDebug() << "Tried to show connection type but connection was nullptr";