Added never_expire_vehicles, reads and writes correctly
Added separator lines on both tabs, may add more.
Added read sections for plane_crashes, plane_speed, and road_side. The read works fine.
Changed ActionPerformed listeners to CaretUpdated listeners for the textFields on the vehicle tab, will do the same for the ones on the first tab.
Added CaretUpdate listeners to textfields in difficulty tab. Removed ActionPerformed listeners for them.
Added separator lines on right side of difficulty tab.