AEX-7: Data Serialization

[AndreasGassmann]

Discussions-To:

https://forum.aeternity.com/t/aex-7-data-serialization/3461

Content URL

https://github.com/aeternity/AEXs/blob/master/AEXS/aex-7.md

[AndreasGassmann]

It has been agreed that this AEX will be closed because of overlap with AEX-2 (#101). Another AEX, only concerned about the transport layer and not about the message format, will be opened later.

[noandrea]

@knarz this AEX is marked as withdraw with #126