add speaking indicator feature for conference #63
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ant-media/Ant-Media-Server#6161
This PR adds ability to detect which participant is speaking in a conference room.
Speaking text will be displayed on right bottom of participants surface view renderer if their audioLevel is higher than a certain treshold.
Local participants audioLevel is not coming from datachannel. Seems like server only sends remote participants audio level through data channel.
To solve this local participants audio level is periodicly retrieved from webrtc clients stats collector.
TODO:
add testing after first review, because changes are not small