v0.14.3 - automatic track management

Automatic quality management

The SDK could now automatically control the quality of video tracks it's subscribing to match the UI elements they are attached to. It will also perform visibility detection on elements and pause video subscriptions when they are not visible. This improvement drastically improves the number of tracks clients can subscribe to and reduces bandwidth requirements.

Other changes

• Screen share audio is a track source #71
• Fix multiple tracks of the same source being published 1c6b68f
• Option to keep local tracks to keep running after disconnection #79

Thanks to @lukasIO for proposing and contributing the improvements