The HTML5 video element already has a well-supported "playbackRate" attribute
which can be used to increase playback rate. This change wires up that control
to be displayed in the Jellyfish web player.
The playback rates offered are between 0.5x and 2x in 0.25x increments, which
matches the YouTube player. This change also wires up the ">" and "<" key
events to increase and decrease the playback rate, which mirrors the keyboard
shortcuts supported by YouTube.
qualityoptions.js assumes that all videos are wider than 16:9 (1.77).
So a video with resolution 1440x1080 (4:3 1080p) only exposes options of 720p as the width is not considered for
1080p.
This fixes that by checking if the aspect ratio is less than 1.77, and if so padding the width to 16:9.
