gst-play: Allow switching to previous tracks
Implement case sensitive key-press handling, and make 'V', 'A', 'S' switch to the previous video, audio, or subtitle track. The lower-case keypress cycles to the next track, as before
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Implement case sensitive key-press handling, and make 'V', 'A', 'S' switch to the previous video, audio, or subtitle track. The lower-case keypress cycles to the next track, as before