Agora RTC Objective-C API Reference Refactor

### - h -

- hasAudio : UserInfo
- hasVideo : UserInfo
- height : ExternalVideoFrame , VideoFrame , EncodedVideoFrameInfo , ImagePayloadData , InjectStreamConfig , LiveTranscoding , LocalVideoTrackStats , MixerLayoutConfig , PublisherConfiguration , Rectangle , RemoteVideoStats , RemoteVideoTrackStats , RtcImage , RtmpStreamingVideoConfiguration , TranscodingUser , TranscodingVideoStream , VideoCompositingLayout::Region , VideoDimensions , VideoFormat , VideoFrameData
- highLightColor : ScreenCaptureParameters
- highLightWidth : ScreenCaptureParameters
- hw_ear_monitor : ILocalAudioTrack::LocalAudioTrackStats
- hw_encoder_accelerating : LocalVideoTrackStats
- hwDecodingLevel : CodecCapLevels
- hwEncoderAccelerating : LocalVideoStats