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In this commit, we implement the latest version of the RBF loop as described in the spec. We remove the self loop back based on sending or receiving shutdown. Instead, from the ClosePending state, we can trigger a new loop by sending SendOfferEvent (we bump), or OfferReceivedEvent (they bump). We also update the rbf state machine w/ the new close addr logic. This log ensures that the remote party always sends our current address, and that if they send a new address, we'll update our view of it, and counter sign the correct transaction. We also add a CloseErr state. With this new state, we can ensure that we're able to properly report errors back to the RPC client, and also optionally force a reconnection or send a warning to the remote party.