[Weather] Add "drizzle" icon for weather

[stvzldn]

I think MTB needs to have a icon for "Drizzle" which would show a single water droplet under the cloud (See example image below).
I log drizzle when there is a very brief light shower or foggy conditions.

[wolfgang-ch]

Where is the origin of this icon?

We have to be extremly careful because of the copyright when using external resources, even for very small sizes

[stvzldn]

I was not thinking fully - the first request icon was captured from my ST3 install and only meant to illustrate the request.

I have edited the MyTourBook three drop icon to a single drop which I offer below:

[FJBDev]

Where is the origin of this icon?

The icon comes from ST 3.1 (see screenshot below) but I don't think stvzldn meant to reuse this icon but instead, asking to add a similar icon in MT that would depict a very light rain shower/drizzle

[FJBDev]

As of today, in MT, there is:

• Scattered showers
  

• Showers
  

"Drizzle" might be a good name for this new one.

OpenWeatherMap calls it Drizzle

WWO also uses "Drizzle"

WeatherAPI also uses "Drizzle"

[wolfgang-ch]

MT 22.6 will have updated weather icons 4da0f1e but in 22.6 there will be no new weather icons, this is postponed

The second row is for the dark theme

[GurVJ]

IMO the icon that is missing is the one for partially cloudy weather with some rare showers, like this one :

[FJBDev]

Drizzle icon added in MT (PR here)