Replacing UAL with Wharf

[aaroncox]

Description

There's still a lot to be done and this is a draft PR not meant to be merged in (at least not yet). It's my exploration integrating the Wharf Session Kit into OBE and replacing all of the UAL code/hacks OBE currently depends on.

I have a lot of comments about how OBE could be simplified and how the user interaction flow could be modified - but need to find the time to write all that up. I'm putting this up as a draft pull request just for visibility and discussion 👍

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[aaroncox]

Also just to note I haven't implemented any "real" wallet plugins, so this is only really working well with the Jungle 4 configuration. As soon as the Anchor wallet plugin is ready (we're still fixing bugs), I'll get that added in and it should work with all networks.

[aaroncox]

The MockWalletPlugin is set now to use whatever network you're on, and simulate a login to the eosio@active account for testing purposes. Every transaction you try to perform is going to fail (for obvious reasons), but it'll at least allow interaction with the login/logout/restore/transact flows.

[aaroncox]

I've added the Anchor and cleos wallet plugins now, I think it's mostly functional. Still cleanup to do on our end as well as in the OBE to remove all the other cleos presentation stuff.