REPL with predefined hooks for attachable socket server.

Initialize repl in user namespace and make standard repl requires.

Enhanced :read hook for repl supporting :repl/quit.

Start a socket server given the specified opts:
 :address Host or address, string, defaults to loopback address
 :port Port, integer, required
 :name Name, required
 :accept Namespaced symbol of the accept function to invoke, required
 :args Vector of args to pass to accept function
 :bind-err Bind *err* to socket out stream?, defaults to true
 :server-daemon Is server thread a daemon?, defaults to true
 :client-daemon Are client threads daemons?, defaults to true
Returns server socket.

Start all servers specified in the system properties.

Stop server with name or use the server-name from *session* if none supplied.
Returns true if server stopped successfully, nil if not found, or throws if
there is an error closing the socket.

Stop all servers ignores all errors, and returns nil.