General Key format added to spec

[XavierChanth]

Is your feature request related to a problem? Please describe.

When explaining the underlying key structure, it was very difficult until I pulled up this old slidedeck:

Describe the solution you'd like

A general format key listed before the 5 variations, preferably as a diagram, and avoiding heavy regex syntax. (The idea is that it would give you a general understanding of the format, before reading about each one's details)

Describe alternatives you've considered

No response

Additional context

Would love some feedback on this idea, I know something like this isn't necessary in a specification, but it would make the specification a lot more understandable.

[gkc]

I've covered this in a larger update to the protocol spec. Keeping in sprint but reducing SP to 0

[gkc]

Didn't get as far as getting changes reviewed in PR59; moving to PR60 for completion

[XavierChanth]

Can this be closed @gkc

[gkc]

Not yet; didn't get more time on this in last couple of sprints, will prioritize the work to finish off my in-flight protocol spec update this week