VEX-6011: Align AVOD resolutions with available resolutions on Content (#14)

Add support for content tracks and improve track selection to work even during ads playback.

Video.js

@@ -477,6 +477,7 @@ Video.propTypes = {
   playWhenInactive: PropTypes.bool,
   ignoreSilentSwitch: PropTypes.oneOf(['ignore', 'obey']),
   reportBandwidth: PropTypes.bool,
+  contentStartTime: PropTypes.number,
   disableFocus: PropTypes.bool,
   disableBuffering: PropTypes.bool,
   controls: PropTypes.bool,