Feature: Sync songs between host and clients

[MatanRad]

Feature suggestion + PR: Synchronize the game's soundtrack between the host and the connected players

[linonetwo]

Will this be merged this year?

[Zetrith]

Not in the current state. It would need to get more polished to get merged:

• This is a niche feature, there should be a config option for it.
• The player's update loops can diverge and songs might get cut off in the middle. There should at least be a fade out/in implemented.
• A current implementation detail of Multiplayer is that mod lists are exactly the same on all clients. This might not be the case in the future and a client might not have the same songs available as the host. This needs to be handled nicely but as far as I can tell the code currently throws an exception when a given song doesn't exist.