IO to get state of another contract

[steinerkelvin]

Allows to get and process the dup of the stored state of another contract.

Useful for native code that process the state and extract new info of contracts that don't have an action to return it's entire state without having to process it externally.

cc @VictorTaelin

[developedby]

If anyone can put the state behind dups, won't they be able to increase the cost of accessing that memory? This would increase the cost of using a contract for anyone else that comes after.

[steinerkelvin]

Top-level dups are resolved before the result is persisted.
I'm not sure what would happen on nested dups.

[steinerkelvin]

I have an idea of how this would work as intended, but I need to first polish my thoughts and document the solution to the general "storing lazy state" problem, as this is very related to it.