JSON save to file and load from file should remember last location
It would be great, if the JFileChooser dialogs in the GUI's tabs "Simulation", "Model", "Pedestrians", and "Topography" would remember their last location.
Common use case: Load a generated test topography from a separate file in a directory other than the project directory.
Save and Load dialogs of one tab should maybe share one location. Dialogs from different tabs should probably not share the same location, since they are for different "file types".
Default can be the project directory. Or store it in something like an ini file to restore it in the next session.