NetworkChanged not firing when endpoints change

[FabianNitsche]

The observable NetworkViewModel.NetworkChanged does not fire if Endpoints are added or removed. Is that the expected behavior?

If not, I can provide a PR.

If yes I can handle this outside, no problem.

[Wouterdek]

Hmmm, the general intent behind that observable is to push changes that change the meaning/"value" of the network. I guess it makes sense to include changes in inputs/outputs. Changed in c9a7344.