Improvements to video conferencing

We have added number of improvements to our video conferencing. Here's what's new:

1. Audio/Video options for participants. Participants can now select audio/video device when joining. Before this, we just picked their default connected devices. 
2. Chat notification when someone messages during class. You will see a chat notification on top right of your screen whenever someone sends a message. 
3. We have added back "click to toggle full screen" mode for instructors and participants. Both you as an instructor and participant can toggle full screen views for your personal view and for instructor view (on participant side). 

If you have feedback for other improvements, please let us know at help@vstudio.live.