Music player: move play queue from button to elsewhere

[HenkKalkwater]

Currently, the play queue in the music player is accessed by pressing a button, but I'd like to use that button for another function.

I think it would be nicer if it can be accessed by swiping down on phone-sized screens. Another option could be to put the play queue as an attached page to the current page. This has as main benefit that the page could automatically be scrolled towards the currently playing item.

On larger screens, the play queue could always be shown in a second column next to the player status.