检查代码块中是否有任何控件被更改。
当需要检查 GUI.changed 是否在代码块中设置为 true 时，
请按如下方式将代码封装在 BeginChangeCheck () 和 EndChangeCheck () 中：
EndChangeCheck 仅当 GUI.changed 在代码块中被设置为 true 时
会返回 true；但如果 GUI.changed 在内部被设置为 true 或者
从开始时就为 true，那么它将为 true。
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