Remove subgraph configuration behaviour from Socket node

Socket node previously was able to push configs from incoming messages down into it's subgraph in the same way as a WithConfigs.

Not only was this a duplication of functionality (bad architecture smell) but tightly coupled the scene graph to a data format.

Now the Socket just reports each incoming message to a listener, which then processes the message. The listener then has the freedom to do things like fire state at nodes in events, configure them directly etc.