Port to libgweather-4
libgweather-4 will be released with GNOME 42. It has many breaking changes. Initial Setup needs to be updated accordingly.
GWeatherLocationEntryis gone in libgweather-4, to rid the library of a dependency on a specific version of GTK. Apps need to implement their own.
GWeatherTimeZoneis gone in libgweather-4, superseded by GTimeZone.
- A few miscellaneous changes, like making some structs into GObjects.