NW/GIS: Update sample models to work in NetLogo Web

[LaCuneta]

NetLogo Web has recently added support for the NW and GIS extensions. These extensions include data loading/saving commands that only work on the local file system, but now we've added string-based alternatives so NetLogo Web can load and save data for them, too. This PR updates the NW and GIS code examples to work with NetLogo Web.

• Add a new GIS Airport Example, based on the GIS vector tutorial, and add its data files for reference or updates.
• Update GIS General Examples and GIS Gradient Example to use embedded resources for their data; resources are still also kept in the report for reference or updates.
• Update NW General Examples to include saving/loading networks to/from strings and loading from embedded resources.

The GHA tests did not pass, but I don't think they're passing on main, either. Manual tests all went fine for me in 7.0.4 and NLW latest. Let me know if you need any changes. Thanks!

[FranzZhao]

Thanks, Jeremy! All functions and all the example models work well. I only have one suggestion about the NW General Examples model.

Since there's a "save to file" button in this model, I expected a matching "load from file" button. At first glance I mistook "load from resource" for the button that would load the network I just saved, but it actually loads an example network instead.

Would it make sense to rename "load from resource" to "load from example," and add a separate "load from file" button that loads what the user just saved? That would make the save/load pairing clearer.

Thanks!

[LaCuneta]

Hey Franz,

Thanks for the feedback. I went ahead and restored the file load button with a check that the file was saved first. That will error on NetLogo Web, but that's expected as it's unsupported there, so the message should be clear.

I renamed the resource load button to "load example resource" as I want to emphasize the source of that data.

Let me know if you need anything else.

[FranzZhao]

Thanks, Jeremy! This looks great!