horizontal wind direction change

added the ability to change the horizontal direction of the wind

This is an experiment  which should be played, because it seems that in a more complex game (with technologies enabled, etc.), you can literally "catch the wind" and move left and right across the map.

On the other hand, with this approach, the point of "flying to one edge" completely disappears - it shifts towards exploration & travel, which seems to be exactly what you want to add to the game.