Console UI

After internal design discussion in the past we wanted to build a "console" UI so that the app could be tested in integration tests without having to rely on Zemu to receive all bits of the UI, but instead print to console or similar.

Currently we have a MockDriver dedicated for this but it's not quite right, as it takes something that prints the UI and gets all the pages out of it, instead of acting as a backend to the normal functionality.

We do have a stub "console" ui, but it's all stubs

See related Zondax/ledger-tezos#92

/cc @jleni

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