refactor pluginMediaTracks lifecyle in PluginRTCPeerConnection, add canvas drawImage SHIM, add MediaStream(Track)?.clone

[hthetiot]

Should fix following issues:

• Fix Support canvas drawImage(videoElem...) canvas drawImage(videoElem...) cause memory leak via RequestFrameAnimation #582
• Fix MediaStreams with same ID but different source should be distinct MediaStreams with same ID but different source should be distinct #561
• Fix Problem with change camera during video call (replaceTrack is not a function) Problem with change camera during video call (replaceTrack is not a function) #491
• Fix Add support for MediaStreamTrack.clone() method Add support for MediaStreamTrack.clone() method #474
• after disconnecting there is still a large amount of MediaStream objects in cordova.plugins.iosrtc.mediaStreams. after disconnecting there is still a large amount of MediaStream objects in cordova.plugins.iosrtc.mediaStreams. #575
• Fix duplicate Frontend Camera

May help with following issues:

• Fix republishing Track fail using Twillio republishing Track fail using Twillio (Was Error: removeTrack() must be called with a RTCRtpSender instance as argument) #569
• Fix Video Sometimes Not Shown when using Apizee Video Sometimes Not Shown when using Apizee #583

Will be updated to also handle this issue:

Testing

To test branch

cordova plugin remove cordova-plugin-iosrtc --verbose
cordova plugin add https://github.com/cordova-rtc/cordova-plugin-iosrtc#bugs/PeerConnectionTracks --verbose
cordova platform remove ios --no-save
cordova platform add ios --no-save