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.
This is just isolated functionality, mainly so I can have a structure of "if(instanceof FileReferenceModel)". After all, the functionality is done using the edge to the FileModel.