Improve Graph Rendering

[RamonMeffert]

• Consider rendering the first N agents in a circle to improve quality of rendered graph
• Look at how GraphViz renders graph (probably very hard)
• At the very least, make sure nodes do not overlap

[RamonMeffert]

This should also take into account the reworked graph data structure (#28), as currently edges can overlap (I think)

[RamonMeffert]

A possible improvement for this might be to use Graph.update when a change to the graph is made. I have a feeling this might keep nodes in the same positions. Not sure though

[m4lvin]

Some examples that are currently rendered with overlapping nodes:

• Ab B bCd D dE (a "double bush")
• Ab B bC D E F (some disconnected nodes)
• A B abC abD abE abF (some nodes with the same links)

[RamonMeffert]

The library I'm using to render the graph, elm-visualization, just received a major update. Notably, they've added support for collision detection in force-directed graphs. This will solve this problem! I'll update to this new version when I find some time, hopefully soon.

[RamonMeffert]

Should be better now!