WIP: Bug/paypro

 * Refactors PayPro, model and controller (remove duplicate code, add peer payment fetching, new tests)
 * Refactors Addressbook (remove signing)
 * Refactor send and sign functions in Wallet
 * Removes networking in 1-1 wallets.
I moved all `Wallet.prototype.send*` logs to 
https://github.com/bitpay/copay/pull/1867/files#diff-0b1ade136278368b49e980437c1d71fbR1169