Nullable support for VLC MediaPlayer.media as of 3.3.18b11

@property (NS_NONATOMIC_IOSONLY, strong) VLCMedia *media;
↓
@property (NS_NONATOMIC_IOSONLY, strong, nullable) VLCMedia *media;

VLCMediaPlayer.media has a nil state internally, so I think it's better to add nullable.

I apologize if I'm wrong.

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