fix: replace defunct weather API with Open-Meteo

[Ste1io]

• Replaced original weather API with Open-Meteo, removing need for API key
• Implemented geocoding for location lookup using city or postal code, and setting location directly with latitude and longitude instead of zmw
• Added config file versioning
• Changed metric flag type to bool; valid config ini values are now "true/false", "yes/no", "1/0" (case-insensitive)
• Added improved error handling and user notifications
• Updated configuration management to save new keys in settings.ini
• Refactored UI updates for weather conditions and forecasts
• Includes helper functions for weather code lookup, wind direction conversion, date handling, and ini file error handling
• Added documentation comments

fixes #21

[Ste1io]

Something went spaztastic on me and this got merged prematurely. Opening new PR with remaining changes.