getAudioTracks/getVideoTracks/createObjectURL/unified-plan/plan-b

"addTrack" is now default and is the only supporetd option.
"ontrack" is now default and is the only supporetd option.

Which means that following items are removed:
1) nativePeer.addStream
2) nativePeer.onaddstream
This is happening internally. Codes will be untouched.