RESCOPE: Update Universal Reference Architecture for Digital Wallets #writing

At #RWOT9 in Prague @ChristopherA and @JoeAndrieu shared as a topic paper [What’s in Your Wallet?](https://github.com/WebOfTrustInfo/rwot9-prague/blob/master/topics-and-advance-readings/whats-wallet.md) on the topic of architecture for digital wallets.

A more complete, but slightly older version is available in a private google doc at https://docs.google.com/document/d/1fbYVhiVd0ES2lHZ6zjYUfj9kVp_HOED6ROmY7ULpUWc

We need to update and publish this document given the latest thinking given Gordian Principles, our reference architecture given our reference apps, Smart Custody 2.0, our Silicon Salon, etc.