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Created an atomic_int connect_state that keeps track of not yet connected, connected, disconnected, and errors. Used to implement good error behavior when the server is down and you start() a Redox instance, or when the server goes down in the middle of running commands. Now, nothing should hang, but should return errors (or throw exceptions) when the server goes down. Also added hooks for a user connect/disconnect callback in the constructor, which is helpful for client programs. Added an example with three Redox clients in one thread.
