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* Expected vs actual Layer based connection quality. With VBR streams (like screen share), bit rate is not a good indicator of whether desired layer (spatial/temporal) is achieved due to high variance. Using expected vs actual layer (i. e. distance to desired) can capture any short fall and include it in quality scoring. This PR uses distance to desired, i. e. how many steps it would take to go from actual spatial/temporal -> desired spatial/temporal and that distance is propotionally used (currently it is just linear) to decrease score. * wire up layer transitions for screen share tracks