Adoption of EIP-681

[davidyuk]

The current version of AEX-4 based on BIP-0021 adding some breaking changes to it without proved rationale. I propose to take EIP-681 as a base for AEX-4, and try to adopt it changing as less as possible. Most of the things are implemented better there, especially an ability to call the contact method.

https://github.com/ethereum/EIPs/blob/master/EIPS/eip-681.md

[shekhar-shubhendu]

EIP 681 is still a draft. Therefore, if we adopt it then we can not finalize the AEX until the base EIP is finalized.

[davidyuk]

Why we can't finalize it internally? They have invested more resources into developing that standard, it does not have the sense to ignore it even if it has a draft status.

[marc0olo]

@davidyuk I see many comments from you to AEX-4 and EIP-681 now seems to be final. it would probably be good to adapt it. do we follow any analogy to other chains right now in that regards?

personally I don't like to have AEX-4 in the title as it is independent discussion IMO. AEX-4 has been withdrawn anyway. so I am changing that.