Scan Folder dialog now remembers last location

When you add a new scan folder location it will now remember the last location used so you can add a bunch of folders in a row easily.
Well when a codebase has this many inconsistencies everywhere you might as well right click and do a refactor on stuff you notice because no one is ever going to do them all. But I see that I need permission on this project even to rename something and should ask for every variable name ahead of time in case the one I choose isn't exactly what is wanted.