Agora RTC Objective-C API Reference Refactor

### - c -

- cacheSize : AgoraMediaPlayerCacheStatistics
- cameraDirection : AgoraFocalLengthInfo
- captureAudio : AgoraScreenCaptureParameters2 , AgoraScreenCaptureParameters
- captureMouseCursor : AgoraScreenCaptureParameters
- captureSignalVolume : AgoraScreenAudioParameters
- captureTimeMs : AgoraEncodedVideoFrameInfo
- captureTimestamp : AgoraAudioPcmFrame
- captureVideo : AgoraScreenCaptureParameters2
- ccMode : AgoraEncodedVideoTrackOptions
- channel_num : AgoraMediaRecorderConfiguration
- channelId : AgoraEchoTestConfiguration , AgoraExtensionInfo , AgoraMetadata , AgoraMixedAudioStream , AgoraRecorderStreamInfo , AgoraRtcConnection , AgoraVideoLayout
- channelName : AgoraChannelMediaRelayInfo , AgoraRtmChannelInfo , AgoraRtmLockEvent , AgoraRtmMessageEvent , AgoraRtmPresenceEvent , AgoraRtmTopicEvent
- channelNumbers : AgoraAudioPcmFrame
- channelProfile : AgoraRtcChannelMediaOptions , AgoraRtcEngineConfig
- channels : AgoraAudioFrame , AgoraEncodedAudioFrameInfo , AgoraRtmGetUserChannelsResponse , AgoraRtmWhereNowResponse
- channelTopic : AgoraRtmMessageEvent
- channelType : AgoraRtmChannelInfo , AgoraRtmLockEvent , AgoraRtmMessageEvent , AgoraRtmPresenceEvent , AgoraRtmPublishOptions , AgoraRtmStorageEvent
- chartName : AgoraMusicChartInfo
- clientRoleType : AgoraRtcChannelMediaOptions
- climaxSegmentList : AgoraMusic
- codecCapLevels : AgoraVideoCodecCapInfo
- codecCapMask : AgoraVideoCodecCapInfo
- codecName : AgoraRtcMediaStreamInfo
- codecType : AgoraEncodedAudioFrameInfo , AgoraEncodedVideoFrameInfo , AgoraEncodedVideoTrackOptions , AgoraVideoCodecCapInfo
- color : AgoraVirtualBackgroundSource
- colorSpace : AgoraOutputVideoFrame , AgoraVideoFrame
- compressionPreference : AgoraAdvancedVideoOptions
- configs : AgoraSimulcastConfig
- connectTimeMs : AgoraChannelStats
- containerFormat : AgoraMediaRecorderConfiguration
- contentHint : AgoraScreenVideoParameters
- count : AgoraMusicCollection
- cpuAppUsage : AgoraChannelStats
- cpuTotalUsage : AgoraChannelStats
- cropArea : AgoraRtcVideoCanvas
- cropBottom : AgoraVideoFrame
- cropLeft : AgoraVideoFrame
- cropRight : AgoraVideoFrame
- cropTop : AgoraVideoFrame
- currentState : AgoraRtmLinkStateEvent
- customType : AgoraRtmHistoryMessage , AgoraRtmMessageEvent , AgoraRtmPublishOptions , AgoraRtmTopicMessageOptions
- customVideoTrackId : AgoraDirectCdnStreamingMediaOptions , AgoraRtcChannelMediaOptions