Control playback speed

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player.setPlaybackSpeed(1.5f)       // Picks the closest supported speed if needed
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val speed = player.getPlaybackSpeed()

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player.fast()       // Jump to next speed (wraps around)
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player.slow()       // Jump to previous speed (wraps around)
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player.normalize()  // Reset to 1.0x

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val all = player.getAvailablePlaybackSpeeds() // FloatArray of supported speeds

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override fun onPlaybackRateChanged(rate: Float) {
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    // Playback speed updated
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}