Add Yandex Music support

[rustamzh]

Implemented major features, but not sure about artUrl. In Yandex Music art url has format:

avatars.yandex.net/get-music-content/63210/e4668dc0.a.2188647-1/200x200

But I have not seen MellowPlayer display any.

[ColinDuquesnoy]

Nice! Thank you!

About the artUrl issue, may I ask you to post the logs (run with --log-level 1 or 0 if you don't see meaningful information).

[DmMlhch]

Regarding the album art: looks like the only way to get it working is to add "https://" to the URL reported by Yandex Music's API.
I've also noticed one more bug - null reference errors in update( ) function when the queue is empty. I can send PR tomorrow to fix this

[rustamzh]

@ColinDuquesnoy Also seen in logs null reference errors, but I attribute them that js file with Yandex API is not loaded yet. Is there any special way to stub the update until API is loaded?

[rustamzh]

The only error left in logs is this line:
[E] [2018-04-20 09-58-07:146549] [js] 20 9:58:07 AM.138
I have checked log-level 1 and 0 and did not get much info than this.

[ColinDuquesnoy]

@rustamzh The error might be coming from yandex itself, do you have a similar warning in the JS console of chrome or firefox?

[rustamzh]

@ColinDuquesnoy Just verified. Indeed I have. It is error similar to the error from the script that detects adblock

[ColinDuquesnoy]

Everything looks good except the logo. Do you think you can adapt the logo's color and style to match the logo of other services? If you're not good at this kind of stuff, just let me know and I'll ask @CelineThiry to make the necessary adaptations.

[rustamzh]

@ColinDuquesnoy I did my best

[ColinDuquesnoy]

Nice, thank you for your contribution!