Windup 210: Simplification of Classification and Hint

Not sure if you will like the classification simplification, it is quite hacky.
However, I seperated both simplification to two different commits.

Both of them are now able to use the "pass variableName from Iteration" simplification.
I think Ondra is suggesting a default iteration at the base level. That's actually an interesting idea. I think this is a 2.x Future or 3.x Future feature, though because it would require a significant amount of work. (Basically requires adding an extension point to the Rewrite API to allow decoration of the input passed to .when() and .perform()