private void button12_Click(object sender, EventArgs e)
 {
     if (speedUp == false)
     {
         speedUp = true;
         world.SetSpeedUp(true);
         (sender as Button).Text = "Speed x10";
     }
     else
     {
         speedUp = false;
         world.SetSpeedUp(false);
         (sender as Button).Text = "Speed x1";
     }
 }