//despawn the tower and give back the money
public void despawn()
{
GameObject moneyAddObj = Instantiate(moneyAdd);
MoneyAddedBehaviour moneyAddBehave = moneyAddObj.GetComponent <MoneyAddedBehaviour>();
moneyAddBehave.activateRefund((int)(GameManager.instance.getRefundMoney(selectedTower.getTowerType())), selectedTower.transform.position);
TowerGridBlocker blocker = selectedTower.gameObject.GetComponent <TowerGridBlocker>();
blocker.removeGridStatus();
GameManager.instance.refund(selectedTower.getTowerType());
Destroy(selectedTower.gameObject);
GameEvents.current.TowerUnselected();
GameManager.instance.currentStatus = GameStatus.PLAY;
OnTowerUnselected();
}
