Update playing status

[anonwins]

Hi again,

I have a new feature request. A method to update the playing status so that the play button will become pause button and the reverse.
That would be possible with 3 ways that I can think of:

1. By setting the initial icon (play or pause) in the .ShowNotification method (I wouldn't recommend)
2. By having a new method that controls the icons (this will also help enable/disable previous/next buttons whenever needed)
3. By having a new method that triggers the play/pause icon click.

Just my thoughts. If I knew a bit more about java I would make a pull request or fork