0.52-Beta

In this release, the big feature is the addition of weather effects. We also have some new objects to fly around: the cooling towers and the Car is made user-playable (as an experimental feature)

Also numerous bug fixes and some small changes. One of which people seemed to moan about was the default rates on the plane were too sensitive, so the default now makes it much more gentle.

More info about this release in the following YouTube video: https://www.youtube.com/watch?v=cQi1ChurNBw