Weather: Implement isServiceEnabled() direct query

Problem: In SystemUI (or anywhere else really) when a theme change
         occurs, we could only rely on a possible sticky intent to
         get service enabled state. So if the sticky intent isn't
         there, the feature would be hidden since default visibility
         should be false.

Fix:     Implement service state direct query from WeatherProvider

Conflicts:
	core/java/org/codefirex/utils/WeatherInfo.java