feat(multi-currency): multi-currency support (fiat + crypto)

[ghost]

This gives multi currency support for all FIAT currencies in coinmarketcap api.

Allows for all cryptos as well, but not sure how to handle that best as there are over 1500 and I need input on the best implementation for that (or we just add it to the list, and the dropdown gets huuuuge).

TODO:

• [ ] Finalise styling
• [ ] Decide on crypto implementation
• [ ] Implement in sending form (see below)
• [ ] Look at using the currently existing system (formats.js) for formatting (it would still require an array of the available cmc fiat currencies so this is why i did it separately - currently approaching CMC about including the FIAT options in their api)

Quick screencast:

Send form implementation:

I think it would make sense to have one primary currency that shows in the sending form. I think it makes sense for the medium term adoption level as people will still want to easily relate what they're sending to their local fiat currency.

[zhyatt]

The NanoWalletCompany is no longer supporting this app. See https://nanowalletcompany.com/ for details. Closing.