Some tidyups to address #3
Description
- go through the case where a node didn't receive a matching pre-prepare message
- need to convert most of the data structures where messages are being pushed onto an array into single elements. so e.g.
acceptedPrePrepares[view][sequenceNumber]should return a single object, not an array of objects - possibly don't need to track messages in all views at each server
- show proper fields for each message and node type in the message and node modals