public void ToggleUpgradeButtons()
{
if (upgradeMenu == null)
{
Start();
}
upgradeMenu.ToggleDamageButton(CanAfford(damageUpgradeCost));
upgradeMenu.ToggleFireRateButton(CanAfford(fireRateUpgradeCost));
upgradeMenu.ToggleHealthButton(CanAfford(healthUpgradeCost));
upgradeMenu.ToggleHealingButtons(CanAfford(healingCost));
}