gtk: Option to select whether music pauses when focus is lost or not
#43750 is about to pause to music when the client loses focus, i.e., when the user goes to do other things than playing freeciv. While I think it's a good default, we may want to provide a setting for it.
Likely want to make this client-common, rather than just gtk-client one.
#43750 is about to pause to music when the client loses focus, i.e., when the user goes to do other things than playing freeciv. While I think it's a good default, we may want to provide a setting for it.