Fix minigun bullets sometimes failing to hit when shooting same thing twice in row alfadur says: “the stale collision cache is searched in, so if you shoot at same thing twice in a row, chances are it woudln't get hit”

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

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