Unity 2020 匯入 standard assets 產生 GUIText is obsolete 錯誤訊息

 error CS0619: 'GUIText' is obsolete: 'GUIText has been removed. Use UI.Text instead.'

SimpleActivatorMenu.cs

新增：

    using UnityEngine.UI;

更改：

        public GUIText camSwitchButton;

->    public Text camSwitchButton;