weather block: add more icons

[ammgws]

Currently we only support clear, rain, clouds, thunderstorm and snow:

i3status-rust/src/blocks/weather.rs

Lines 258 to 265 in d39cd39

	self.weather.set_icon(match raw_weather.as_str() {
	"Clear" => "weather_sun",
	"Rain" | "Drizzle" => "weather_rain",
	"Clouds" | "Fog" | "Mist" => "weather_clouds",
	"Thunderstorm" => "weather_thunder",
	"Snow" => "weather_snow",
	_ => "weather_default",
	});

i3status-rust/src/icons.rs

Lines 148 to 153 in d39cd39

	"weather_clouds" => " \u{f0c2} ", // fa-cloud
	"weather_default" => " \u{f0c2} ", // fa-cloud
	"weather_rain" => " \u{f043} ", // fa-tint
	"weather_snow" => " \u{f2dc} ", // fa-snowflake-o
	"weather_sun" => " \u{f185} ", // fa-sun-o
	"weather_thunder" => " \u{f0e7} ", // fa-bolt

We are grabbing the weather state from the JSON weather.main field which has a limited set of states. If we instead grab the weather.id field then we have much more detail: https://openweathermap.org/weather-conditions

Meanwhile, Font Awesome has some icons we are not using yet, such as "clouds-shower-heavy", which we could then use if we made the change mentioned above: https://fontawesome.com/icons?d=gallery&p=2&c=weather&m=free