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Setup the framework to return payment error via onion error packet.
The spec can be found here: https://github.com/cryptape/fiber-sphinx/blob/develop/docs/spec.md#returning-errors
The encryption has not been enabled yet so I can split the changes into several PRs. The encryption can be enabled later without breaking the network protocol because the decryption phrase will check whether the error has been encrypted or not.
Refs #198