Create and load a testnet wallet during onboarding

[JulianTosh]

Additionally, I'd like to see a faucet call made during the initial install so each new wallet receives (something like) $100 in testnet coins.

[bitjson]

I think this could be really promising if we can get this issue solved: https://github.com/bitpay/copay/issues/4938

[bitjson]

While this could be pretty confusing in the current state of the app, I really like the idea for longer-term development. A lot of bitcoin companies offer "test services" on testnet – with some good design, there's a huge opportunity for us to provide a kind of "network-wide onboarding experience" that other ecosystems just don't have.

I think at minimum we'll need to clearly distinguish between "testcoin" and "bitcoin". It needs to be possible for users to experiment with testcoin without feeling like it's "all mixed in with their real money".

We'd probably need to at least separate the two categories of wallets in the Home tab. We might even need to introduce a general context shift that significantly changes the interface, like a "test mode" the user can "enter" and "exit".

[jdjrog]

Goal: Send testnet coins from one wallet to a testnet wallet in Copay.
Problem: I can't see the Copay testnet wallet address when I click Receive in the app.

So far, I have set up a testnet wallet in copay and now I want to send testnet coins from a wallet outside of Copay into the Copay testnet wallet. The problem is that when I hit "receive", I am only allowed to see my bitcoin mainet personal wallet address, but not my testnet wallet address. What am I missing here?