Added WeatherForecast class
Added "Weather Forecast" tab in AirportDetailsWindow.
Merge branch 'develop' into feature/weather-forecast

Conflicts:
	source/defines.h
	source/ui/windows/airportdetailswindow.cpp
	source/ui/windows/airportdetailswindow.h
Merge branch 'develop' into feature/weather-forecast

Conflicts:
	source/defines.h
	source/network/CMakeLists.txt
UI update.
Added WeatherForecastModel.
Several WeatheForecast fixes.
cleanup
Added WeatherForecast::progressModel().
Segfault bug fixed.
Added bold font for day names.
Weather icons added
Added missing files
Fixed hidden MetarLabel.
WeatherForecast API update.
Using numbers instead of condition descriptions.
Added WITH_WEATHER_FORECAST option.
New icons
WeatherForecastModel::__iconForCondition() instead of map.
Merge branch 'develop' into feature/weather-forecast
Weather conditions update
Conditions update.