Wallet Redesign Architecure Proposal

[dangershony]

This issue is to maintain a collection of links to the proposal by @MithrilMan

Architecture, discussions and issues can be found here
https://github.com/MithrilMan/StratisBitcoinFullNode/tree/research/wallet/src/Stratis.Features.Wallet/Documentation

Note: many of the desired changes where already made in that branch