Added FARWind class

Implemented the FARWind class that acts as an entry point for other mods to add wind.
The Wind velocity is included in (hopefully all) the relevant calculations.

As I anticipated in IRC, this is a completely static class that never throws anything, so at worst it won't work but it shouldn't bring the rest of FAR with it. I think I found all the points where the wind velocity needed to be added: I searched for "Krakensbane" and corrected the velocity adding the wind.

I also checked for each use of "vel", but I didn't find any other point where the wind needs to be considered (then again, I know nothing about how you simulate the airflow, so I might have missed some).