Improve face shielding behavior in general case (bug #4240)

[Capostrophic]

While this doesn't fix wind velocity and direction calculations (meaning broken blizzard behavior is unchanged), it addresses the concerns of the reporter of the issue.

1. Red Mountain as ash storm/blight storm origin hardcoded position was corrected. The relevant code must be completely rewritten, but I kept the changes minimal for now.
2. Storm idle state handling was rewritten with Hrnchamd's research in mind. Instead of stopping the animation almost immediately if the current conditions don't fit the conditions of animation playback, only its looping is disabled. The animation playback itself makes a bit more sense too.