private void UpgradeShop_Load(object sender, EventArgs e)
 {
     foreach (string i in UpgradeMeta.listUpgradesAvaiable())
     {
         listUpgrades.Items.Add(i);
     }
 }
 private void button1_Click(object sender, EventArgs e)
 {
     if (listUpgrades.SelectedItem == null)
     {
         return;
     }
     UpgradeMeta.buyUpgrade(listUpgrades.SelectedItem.ToString());
     listUpgrades.Items.Clear();
     foreach (string i in UpgradeMeta.listUpgradesAvaiable())
     {
         listUpgrades.Items.Add(i);
     }
 }