Fill PageEditTeam containers only when it is actually required: - Reduces frontend startup time for 20-25% on my test machine - Also reduces memory usage when the page hasn't been shown

#include <QtGui/QApplication>
#include "mainwindow.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}