Hide zero and dust token balances

[fcecin]

My account tab displays about 20 zeroed-out token balances. It would be nice to get rid of those so I don't have to to remember that my account is full of dead RAM that I will never recover.

In addition, it would be nice if "dust" balances (e.g. those that round down to less than an USD cent in value) would be hidden too, not only zeroed-out balances, if the wallet can figure out the price of individual tokens.

Also, I find that displaying EOS token balance in the "tokens" panel looks confusing. I would rather only see "EOS Token Tokens" (for the lack of a label like "ERC-20" in EOS) or smart-contract tokens there, and not mix the native chain token (the EOS token balance is already displayed prominently elsewhere).