T1002191 enable new wizard elements

I found a way to auto enable new wizard entries. Together with #748 this solves the last known problem of the new wizard.

They get only enabled once (the first time an IDE with the new wizards is started) and then never again.
Nothing special from my side about failure logging, Eclipse handles that part quite well for preference initializers. I can remove these info messages, they are indeed not very useful and when they even lead to possible deadlocks it would better to not have them.