Allow Music tracks to be ordered.

[Stan]

As pointed out by @wowgetoffyourcellphone and @samulis it would be nice if tracks could be ordered, so that you could have a main track that's always played and some other tracks played in order, or any order.

Related files: gui/common/music.js simulation/data/civs

A simple solution could be to add an Order parameter to civ.json files

{
    "File": "Whistler.ogg",
    "Type": "peace",
    "Order": 1,
}

Then removing the shuffling from the js file or only shuffling tracks with no order

Music.prototype.ANY_ORDER = -1;

[Stan]

In 26573:

Add 24 new music tracks.
Patch by: @Samulis, Omri Lahav
Refs: #6445

[Stan]

Unlikely to get done for A26

[Neinea]

Revision done here ​https://code.wildfiregames.com/D4802 to implement this feature.

[Freagarach]

Pushing back.