Cache enumerateChildNodes

cache.swift

/// If cache is established
if self.updateListeners.count > 0 {
    for listener in self.updateListeners {
        listener(currentTime)
    }
}
/// Rebuild the cache
else {
    self.layers[WorldLayer.World.rawValue].enumerateChildNodesWithName("Character") {
        node, stop in
            let realNode = node as CharacterNode
            
            /// Call update on the node, and then add the update function to the cache
            realNode.updateWithTime(currentTime)
            self.updateListeners.append(realNode.updateWithTime)
        }
}