Network Refactor

[panleone]

Abstract

Objects that inherits from the virtual class Network should only define the corresponding virtual methods, without adding any additional logic.

Currently we have only a Network realization, ExplorerNetwork, that however contained also a lot of additional logic like: safe fetching, retryWrapper, rpc calls and so on.

The aim of this PR is refactoring all this additional logic in a new class: NetworkManager, which contains

• networks: a list of all the available Network;
• currentNetwork: the current selected Network.
• All the logic to switch network when an operation failed, safe fetch and so on.

In this way we can very easily add new Network classes: for example with #427 we found that most network operations can be done by using RPC Nodes. So in a future PR we can add a new Network realization RPCNetwork, and add to NetworkManager::networks the corresponding objects, like

networks.push(new RPCNetwork('rpc.duddino.com'))

And users could use the new network without any additional changes.

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Testing

Test that syncing/sending txs and everything else is working as expected

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[Duddino]

I haven't started the review yet, but can you move everything network in an aptly named network/ folder?