Reddit controls for player

Current Controls:

ArrowUp              ->    Volume +
ArrowDown            ->    Volume -
ArrowRight           ->    Forward 5s
ArrowRight + Shift   ->    Forward 10s
ArrowRight + Control ->    Forward 30s
ArrowLeft            ->    Backward 5s
ArrowLeft  + Shift   ->    Backward 10s
ArrowLeft  + Control ->    Backward 30s
Space                ->    Play/Pause
Key S                ->    Toggle subtitle
Key F                ->    Toggle fullscreen
Key M                ->    Mute/Unmute