Add additional neoscan URLs in Network Settings

[deanpress]

Currently users can only select networks from a set of predetermined neoscan URLs. We should let users add custom ones.

[kitchenSpoon]

@deanpress Do we have to validate if its a valid neoscan URL? or can the user add any string?

[robmoorman]

Entering an invalid url is your own responsibility I would say. Keeping up your (custom) list in Redux would be the way to go. Maybe prefill (as initial state) this with the ones currently hardcoded.

[kitchenSpoon]

Thanks @robmoorman , would asking for a name and a neoscan address, like in this page be enough?
http://cityofzion.io/neon-js/docs/en/basic_privnet.html

[kitchenSpoon]

Is there anything else that needs to be done to move this from In progress to Done?