Settings Panel needs additional fields for Currency, Contract Address and Identity Resolver

[ArghZombies]

There are additional fields requiring management in the Settings panel. See quick mockup for details:

Requires:

• Field for Contract Address (free text field)
• Currency (dropdown) - currently only containing Gromits, which is set by default
• Identity Resolver - label that changes to a free text field when selected (for entry of a URL)
• Tooltip triggers against each field (triggers Onboarding overlay for that field - see Define UX for first time use #113)

[peasandwell]

@ArghZombies this may need to be slightly amended:

• Contract address and the currency are pretty much the same thing, the contract address defines the currency token, rather than it being a separate additional option. Perhaps we could have a plain text area that is updated once the contract address is verified?
• The Identity resolver will probably be descoped for Campfire as it has a fairly low priority (you probably won't need to do anything about this)

[ArghZombies]

Yes, happy with those changes. Fewer fields are always better.

[peasandwell]

I've raised a new ticket for the implementation of the <ContractAddress /> in #156