Feature request: navigation helpers for interacting with really large JSON

[morgen-peschke]

The visualizations are really nice for wide graphs, however navigating is a bit of a pain.

Highlighting the edges on mouseover does help, however in situations where the edges are closely bunched and extend past the edge of the visible section, it can get hard to follow them.

It would be really helpful to be able to do something like press a key and focus on the destination node - possibly f or -> to go to the edge destination, and b or <- to go to the edge source.

Even without full keyboard navigation of the graph, this would be a big improvement when working with large JSON objects.