[Mac] Option for not showing icon for QGuiApplication in Mac panel.

#include <QtCore>
#include <QtGui>
#include <QtWidgets>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    qDebug() << qVersion();
    QString path("/Users/Qt/dev/icon/icon/icon");
    QProcess pr;
    pr.start(path);

    return a.exec();
}

int main(int argc, char *argv[])
{
    QApplication a(argc, argv, false);
    qDebug() << qVersion();
    QFile file("out.txt");
    if (!file.open(QIODevice::WriteOnly | QIODevice::Text))
        qDebug() << "failure";

    QTextStream out(&file);
    out << "Hello world\n";

    file.flush();
    file.close();

    QTimer *timer = new QTimer();
    QObject::connect(timer, SIGNAL(timeout()), qApp, SLOT(quit()));
    timer->setSingleShot(true);
    timer->start(1000);

    return a.exec();
}