Remove unused TextOnNewLineStateChainingListener class

Although this class is in a "public" package I'd like to remove it and thus break backward compatibility since:

• We don't use it anywhere anymore (some previous refactoring removed the need for it)
• We don't have any unit tests specifically for it and thus cannot guarantee it still works
• It's going to affect a very small # of developers: those who are writing new Rendereres and having the need for it. They can just copy it in their own code should they really need it.