Whitelisting of Tokens

A feature/bug requested in the old Parity was that instead of fetching automatically all the tokens a particular account has, the user whitelists the tokens he wants to be shown on the main page.

In particular, there needs to be a page where the user chooses to Add Token (a bit like MM), with the following fields:

• Token address
• Token name
• Token symbol
• Token image (url is enough for now, no need for image uploading)

We could also keep a small database of the most popular tokens ourselves, like MyCrypto does.

(Lower priority, let's focus on sending/receiving Ether first).