Adds ERC20 tokens list to Ledger #979
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Description
Ledger supports a dynamic ERC20 mechanism, requiring that the tokens are signed by some authority defined by a public key in the Ledger app.
This PR adds automatic detection from a signed token list and providing these details for the To and FeeCurrency addresses to the Ledger before an ERC20 transaction.
Tested
Tested against the Ledger and RC1.
Backwards compatibility
This is backwards compatible.