Implement new address generation logic as in upstream
address_from_hex/address_to_hex are now required for encoding/decoding addresses instead of hex_decode/hex_encode
transfer_pre_combine now require source account public key instead of address, since /construction/payloads now requires public_keys field
Implement offline transaction hash calculation for now, though this may be stripped before the next release (users should favor /construction/hash whenever possible)
address_from_hex/address_to_hexare now required for encoding/decoding addresses instead ofhex_decode/hex_encodetransfer_pre_combinenow require source account public key instead of address, since/construction/payloadsnow requirespublic_keysfield/construction/hashwhenever possible)