added SNR lines for neighborInfo and direct routes in map

[jamon]

Initial implementation of SNR route lines (see #456 for discussion)

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[danditomaso]

@jamon This is awesome, thanks for the submission.

[danditomaso]

I wanted to better understand where I would see the lines being drawn, I cloned your branch and opened it up. I didn't see anything connecting avatars on the Map, am I looking in the wrong place?

[jamon]

Directly attached nodes will be drawn immediately so long as your node has it's location set and you've heard from them recently.

Connections between other nodes are drawn when you see a NeighborInfo packet from them, but keep in mind that not all nodes have that turned on, and the node doesn't retain that information, so you'll only see the ones that come in while the client is connected.

We will be able to add traceroutes as a source of data in the future as well.