Move broadcasts out of cProtocol

[worktycho]

As in any packet that is broadcast to any client in a chunk. Eg anything you can send through the cWorld::Broadcast* methods. What I'm thinking of is moving those packets to a separate set of classes. The problem is that I've rigging up a system that lets clients subscribe to encoded broadcasts on a chunk. I've worked out how to handle separate protocol versions. However the cProtocol class is heavily tied to cClientHandle, but my scenario involves having a cProtocol instance that isn't associated with a specific player.