Agora RTC Objective-C API Reference Refactor

### - m -

- MAINTAIN_BALANCED : agora::rtc
- MAINTAIN_FRAMERATE : agora::rtc
- MAINTAIN_QUALITY : agora::rtc
- MAINTAIN_RESOLUTION : agora::rtc
- MAX_USER_ACCOUNT_LENGTH : agora::rtc
- MEDIA_DEVICE_STATE_ACTIVE : agora::rtc
- MEDIA_DEVICE_STATE_DISABLED : agora::rtc
- MEDIA_DEVICE_STATE_IDLE : agora::rtc
- MEDIA_DEVICE_STATE_NOT_PRESENT : agora::rtc
- MEDIA_DEVICE_STATE_UNPLUGGED : agora::rtc
- MEDIA_PLAYER_SOURCE : agora::media
- MEDIA_PLAYER_SOURCE_DEFAULT : agora::media::base
- MEDIA_PLAYER_SOURCE_FULL_FEATURED : agora::media::base
- MEDIA_PLAYER_SOURCE_SIMPLE : agora::media::base
- MEDIA_TRACE_EVENT_VIDEO_DECODED : agora::rtc
- MEDIA_TRACE_EVENT_VIDEO_RENDERED : agora::rtc
- MESSAGE_TYPE_BINARY : agora::rtm
- MESSAGE_TYPE_CONVERGE : agora::rtm
- MESSAGE_TYPE_TEXT : agora::rtm
- MESSAGE_TYPE_UNDEFINED : agora::rtm
- MIX_DISABLED : agora::base
- MIX_ENABLED : agora::base
- MODE_CONTAIN : agora::rtc
- MODE_COVER : agora::rtc
- MODE_END : agora::rtc