Add support for BIP-47 Reusable Payment Codes
References:
- https://github.com/bitcoin/bips/blob/master/bip-0047.mediawiki
- https://raw.githubusercontent.com/OpenBitcoinPrivacyProject/bips/master/bip-0047/reusable_payment_codes-01.png
- https://www.reddit.com/r/Bitcoin/comments/3alzga/bip47_reusable_payment_codes/
- https://github.com/SamouraiDev/BIP47_RPC/tree/master/src/main/java/com/samourai/wallet/bip47/rpc