Excessive data passed to `reactorCallback`

[wjmelements]

The following information is not useful to an IReactorCallback implementation, and can be passed as fillData if actually necessary:

• ResolvedOrder.OrderInfo (all fields)
• ResolvedOrder.sig
• ResolvedOrder.hash
• ResolvedOrder.InputToken.maxAmount

Reducing the data passed to the function will reduce the memory footprint of the execution scope and therefore the gas.

[edit: added to list of unnecessary fields]

[wjmelements]

I suspect ResolvedOrder.InputToken.token and ResolvedOrder.InputToken.amount are also usually unnecessary for most reactorCallback but they at least may potentially be useful to some, unlike the other fields mentioned.