[SDK] Make snow effects configurable

[N316TS]

Here’s another one you guys might want to vote for. Definitely agree that it would be great if developers could tweak things for their needs.

For default scenery, it would be nice to see this:

Get rid of the snow on runways, taxiways, aprons and roads

I just took a couple of test flights following the latest update, and I love the new snow. However, the airports are covered in snow even if it’s not snowing outside. Most airports plow and treat runways/taxiways and aprons during and after snow. So, having snow on these surfaces is very unrealistic. Can we find a way to exclude snow from these surfaces, unless it’s actually snowing? Perhaps we can also exclude large roads and highways too?