Add a new function for getting the handle of a looped sfx track

src/music_box.rs

@@ -263,6 +263,25 @@ impl<'w, 's, T: SuppliesAudio> MusicBox<'w, 's, T> {
 			TrackType::Missing => None,
 		}
 	}
+
+	/// Play a new sound effect on the SFX channel in a loop. Ideal for ambient spatial sounds
+	/// like a crackling fireplace
+	///
+	/// # Returns
+	///
+	/// A handle for the newly started audio instance, or `None` if the track was not found
+	pub fn start_looped_sfx<Name: ToString>(
+		&mut self,
+		name: Name,
+	) -> Option<Handle<AudioInstance>> {
+		match self.map_tracks(name) {
+			TrackType::WithIntro(_, track) | TrackType::Single(track) => {
+				let instance = self.channels.sfx_channel.play(track).looped().handle();
+				Some(instance)
+			}
+			TrackType::Missing => None,
+		}
+	}
 	/// Play a new sound effect on the UI SFX channel
 	///
 	/// # Returns