注册表类，用于跟踪场景中存在的所有 IClipper。
用于在 CanvasUpdate 循环过程中剔除可裁剪元素。裁剪操作将在布局之后，但是在 Graphic 更新之前调用。
| instance | 单例实例。 |
| Cull | 对所有已注册 IClipper 执行裁剪。 |
| Register | 注册 IClipper。 |
| Unregister | 取消注册 IClipper。 |
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