Add personal.signTypedData

[ukstv]

The method signs the data along with the schema, so that a user is well informed on what she signs.
As proposed in ethereum/EIPs#712

[coveralls]

Coverage increased (+0.005%) to 90.562% when pulling 7d76e1d on ukstv:develop into 917d152 on ethereum:develop.

[coveralls]

Coverage increased (+0.005%) to 90.562% when pulling 7d76e1d on ukstv:develop into 917d152 on ethereum:develop.

[frozeman]

As this is not accepted standard yet, and not in geth or parity i can't merge that, also it should be on the eth_ namespace, as it doesn't receive a password as last argument.

[frozeman]

Im happy adding that, if there is a broad consensus.

[elenadimitrova]

Isn't there also a requirement for eth_signTypedData in addition to personal_signTypedData according to ethereum/EIPs#712

[ukstv]

@elenadimitrova It is indeed. It doesn’t matter though as eip712 is not widely accepted. Neither geth nor parity support it.

[Amxx]

+1

[nivida]

Closed because the latest maintenance release was 0.20.7.