Change UI
Move PositionSelect to separate file

* added width / height to the callapp ui for testing
* third party dependencies updated
* added sdp munging example in WebRtcPeer.ts (inactive by default)

Ensure proper playback on iPhone Safari. This browser will automatically play videos in fullscreen if "playsinline" is not set even if the video is never added to the DOM

Workaround added for Safari blocking playback. Playback will resume on first onclick / tab event received