void ClearTurret()
{
if (turret != null)
{
turret.GetComponent <SpriteRenderer>().color = Color.white;
turret = null;
ToggleBuildUI(false);
}
}
void SetTurret(TurretController _turret)
{
turret = _turret;
turret.GetComponent <SpriteRenderer>().color = selectedColour;
ToggleBuildUI(true);
}