Use ProportionalDelegate and simplify code

[notmart]

this does two main things:

• introduces in Weather the usage of ProportionalDelegate to have a fully stretchable UI that maintains the same look and proportions on any window and screen size.
  This is not a silver bullet for every skill, but a good place to start for skills that are not much more than an icon and few text (and the design intent is to show the same result scaled on bigger screens rather than more content)
• Also, componentizes more the weather skill: since every page needs the same JS function to resolve the weather lottie file, put it in a base WeatherDelegate used by all the other pages, also, since there are two identical forecast pages which only changes the days, make a component out of it as well, having forecast1 and forecast2 just instantiating it with a different model

(in general, files that should be used directly, should start with lowercase letter, and those to be reused as components must start with an uppercase letter)