Support tokens with decimals different than 8

[lmuntaner]

The display of tokens in a user-friendly way assumes that the token uses 8 decimals. However, there are a number of tokens that use a different number.

We'd like to hard-code the list of tokens that should be displayed in a user-friendly way:

• If a token isn't in the list, it should be displayed as the raw integer and not formatted.
• If a token is in the list, use the decimals to display the amount.

List of supported tokens:

tokens.json.txt

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