Replacing native functions with bytecode functions

[liquidev]

Thinking about it now, doing this should be entirely within the realm of possibility. It's a matter of swapping out the "executor function" within UFunction. I don't know where the field is in UE3, so it would require some mild reverse engineering to figure that out, but then it can be swapped out with UObject::ProcessEvent or something and it theoretically should run the function within the VM instead of C++.