Weather panel: Reworked Weather, part 4 (Final):

Included:
- Expand/collapse weather panel will expand/collapse
  the weather panel itself, no switch between weather panel and
  weather text bar, the panel topbar will be visible all the time
- Show the current temp and condition on the top bar, too, if the weather panel is collapsed
- Use a smaller text size on the top bar, if the weather panel is collapsed
- Add expand/collapse animations:
  - Weather panel slide animation
  - Top bar text (city) text size animation
  - Top bar text (current temp and condition) text transparency animation

This is the last (final) part of the weather panel rework,
all features/additions mentioned in the first part, (and some more),
are included now, except the 5 day weather forecast,
but this is planned for the future, and will be (possibly) included
in an future update.