Settings screen

[mbernson]

In the Settings screen, it should be possible to:

• Stream the lower quality version on cellular / data saver mode
• Set the default playback rate
• Set the preferred language order (Maybe?) See also: https://developer.apple.com/documentation/avfoundation/selecting-subtitles-and-alternative-audio-tracks
• Prefer the audio recording (Maybe?)

Originally posted by @mbernson in #35