module: double indirection

[lmittmann]

This PR changes the way some types need to be initialized when querying them via RPC.

In the past one could ether initialize a types zero value and pass a reference to it:

// old
var balance big.Int
client.Call(
    eth.Balance(..).Returns(&balance),
)

or initialize its reference:

// old
balance := new(big.Int)
client.Call(
    eth.Balance(..).Returns(balance),
)

This PR allows to define types that are usually used by reference to pass a double indirection instead. So you no longer have to instantiate a type, but can simply write:

// new
var balance *big.Int
client.Call(
    eth.Balance(..).Returns(&balance),
)

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