RCRTCScreen
    Added from 5.1.8 专门用于屏幕共享的流
Functions
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                  Add from 5.1.
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                  public abstract void startCaptureAudio(RCRTCScreenShareAudioConfig config, IRCRTCResultCallback callback)
Add from 5.1.
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                  开启屏幕录制
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                  Add from 5.1.
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                  停止屏幕录制