Fix toString Padding for Address types

[MicaiahReid]

The original intent for Address was to have the following functionality:

const address = new Address("0x1");
console.log(address.toString()) // 0x0000000000000000000000000000000000000001

where the original value, "0x1" is stored, but the toString() representation pads the values with zeros to be a proper address. This isn't actually working, and likely points to overall issues in json-rpc-data and json-rpc-base-types that could have side affects to consider.

As an additional note, this also leads to evm_addAccount adding invalid account addresses to the personal namespace.