Support for open-meteo.com

[opk12]

open-meteo.com (github repo) has a free, well-documented API and does not require a key. I use it daily on Android through omWeather.

In contrast, OpenWeatherMap restricted the API in 2022, I found some comments among the issues of omWeather's OWM-based precedessor here and here, which say that billing info is now required during account creation, even if one plans to stay below the free limit of 1000 API calls; above that limit, the API is not blocked, you're silently charged.

[opk12]

Related: #129

[dglent]

To say the truth, i wanted to rewrite the most of the parts of meteo-qt as it has started for learning purposes and i see many parts where i would do differently now but anyway it works fine.
And i am not very satisfied with openweathermap because many times some features were in the free plan, i have implemented them (6 days forecast, weather alerts, ozone index, ...) and after some time they became paid services... :(
Also the need of a personal key make things hard in the usage of the application.

i will try to find time to rewrite the code and add more providers, thanks for the information for the API of open-weather with a first look it seems a very good solution for a free api !