Automatically scroll to the current playing song

[chrisvoo]

Description
My usual use case scenario is playing random songs. This queues up 500 songs and it may be difficult to find the song that's currently playing.

Example
The idea is:

• add a button in the playlist view, beside the other buttons
• as soon as I click that button, the body of the playlist scrolls to the current playing div

I can try to create a PR if interested.

[phanan]

PR is always welcome :)