* Cleanup callapp for easier use
* Support for async init to have video devices available from the first frame
* better work with recent Chrome changes and if loaded via http / file: url’s (mediaDevices null)
* Will fail now during init some WebRTC features aren’t available to avoid cryptic error messages during runtime
* Added GetBufferedAmount

Fixed an error that was triggered if a call was destroyed immediately after a video stream was created but before the video actually started + fixed swapped audio / video toggles in the examples