We're going to need a whole lot more options than just autocrlf flag.  Eventually we would also need the complete clean filter configuration so we can run clean filters when computing an ObjectId from the work tree.

We probably should create a WorkTreeOptions class in this same package, and make this boolean a final package level member that the WorkingTreeIterator can reach into and inspect.  Then later we can add things like the clean filters to WorkTreeOptions and have them easily carry into the child iterators.