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Add "highestEfficiency" initial track selection mode

Vinay Rosenberg requested to merge github/fork/chromakode/highest-efficiency-initial-track into development

Created by: chromakode

This PR adds a new initial track selection mode: "highestEfficiency". It picks the variant that offers the lowest bitrate for equivalent resolution (similar to the Shaka Player behavior referenced by @japettyjohn in https://github.com/Dash-Industry-Forum/dash.js/issues/3022#issuecomment-509937141). Similar to Shaka Player, this will prefer VP9 over MP4 if it's offered with a lower average bitrate, which is the behavior I was looking for.

In addition, this PR exposes selectInitialTrack and the getTracksWithHighestBitrate/etc functions on the class factory so that they can be overridden using MediaPlayer.extend, to allow end users to define their own custom strategy.

Included are new tests to cover the new track selection mode as well as the other existing ones.

Re: https://github.com/Dash-Industry-Forum/dash.js/issues/3022

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