While working on #374 , I found this issue in the elevation code:

Here, split_whitespace is the wrong method to call. In CLI mode, it fails, leading the elevation code to be skipped.

Does the GUI pass the bbox coords in with space delimiters? The CLI breaks unless you use comma delimiters.

We should settle on one way to do this, or even better, replace the bbox string with an actual struct so we don't have to parse it in worldgen logic.