Rewrite types of link in graph.json

[genofire]

Add wireless typ of link in graph.json
There is already vpn in a link of the graph.json -> a wifi type would also be cool.
So there are all three options of interfaces implementet.

[genofire]

graph.json get the isVPN bei nodeinfo ... should be set by interface.
There could be a gateway which has also a wifi connection to nodes.

[SimJoSt]

typo in title Rewrite typsof link in graph.json -> Rewrite types of link in graph.json

[genofire]

I think i will implement this at next.
Output woud be this way:
{tq:22, stq:22: ttq: 33, vpn: true, type: "fastd"}
wifi and others would be also supported but omitempty.

On this way we did not need and to validate different links for stq and ttq.
A easy validation of type for primitive request for vpn, mesh and others and exacly validation by type.
It is comform with the https://github.com/ffrgb/meshviewer.

@xf- what do you think?

[genofire]

solved in #63