Add thumbs toggle

[varzaman]

Changed the css so if #player had a thumbs attribute, it would hide the shuffle and repeat icons and show the thumbs instead.

[MarshallOfSound]

There is no reason why we can't have an API inside this library to toggle that thumbs attribute.

Some sample code would be inserted into https://github.com/GPMDP/gmusic-mini-player.js/blob/master/src/gmusic-mini-player.js#L181

showsThumbAlways: (always) => {
    const player = document.getElementById('player');
    if (always) {
        player.setAttribute('thumbs', true);
    } else {
        player.removeAttribute('thumbs');
    }
},

[Pluckerpluck]

So is this feature just sitting dead in the water? I've just found GPMDP, and this one aspect is the only minor annoyance I have with it.

It's only really an issue when I sometimes throw on something like the top 50, but mostly I just want to see if I've already thumed up songs every now and then.

[Noxxys]

I would also love to have thumb up/down buttons on the mini player, I use it a lot more than repeat / shuffle. To display all of them, we could make the button smaller, or display thumb up/down on mouse over in the middle.

My use case: I have the mini player always-on-top in a corner of one of my screen and I would like to thumb up/down from there. I could thumb up/down from the systray icon. but I can't see if it's already thumbed up or not from there.