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02aa5610dd
This lays all the groundwork for ProxyNegotiators to be able to issue username and password prompts: ProxySocket now implements the Interactor trait, it will borrow and return a Seat if one is available, and it will present an Interactor of its own to the ProxyNegotiator which can use it (via interactor_announce as usual) to get a Seat to send prompts to. Also, proxy.c provides a centralised system for making a prompts_t with an appropriate callback in it, and dealing with the results of that callback. No actual ProxyNegotiator implementation uses it yet, though.