Added PlantUML onion diagram to protocols docs page #75
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I think this extra visual helps to clarify which direction wrapping / encoding / decoding work.
Online render: https://www.plantuml.com/plantuml/uml/VP2nQiD044HxVSMWAYbCqAaF1EmY44YHTCQ5Sjh81_QkMPqB9_ZVWpV2MYmiDHhUdEQ90x2ZxumiqDHjCzga57CIBWe0KVO7OUACyYEtITwQ4sc9tmBsF3oYN5AKbaeqFLgBjIjNV2s9_ykXTSkVfFl4pSwFp-m7w-yhWYacbfS-fhJgOtCWBvftLPCZ4rtbT3StTkAuLU7qGuedBEdhs7MazcqKfPiVE1SkklVP1EjNtc2nUFQNF4I7muY3mzM8gmis_MNMWX7Ywy4XEXn671okHrmRNhyVy-OF
I wasn't exactly sure where to put this. Maybe a new 'Usage' page (from #73 ) would be better, since at the current location ("C++" > "Protocol") it's a little buried in technical specifics.