Multi threading improvement

Allow there to be multiple directories scanned on different threads, do not await each directory scan however there must be a throttle on the amount of threads

[Example](https://stackoverflow.com/questions/10439916/find-out-how-many-threads-my-application-is-running&ved=2ahUKEwjEp66Bh93rAhXGg-AKHeVXC80QFjAAegQIEBAB&usg=AOvVaw3HNMAoNHiQZ9r6g0ftPRiF)