Import Weather System From Farm

[james-garrett]

As the particle renderer's primary use in the Farm sim was to render weather, it seemed natural to include it as a design feature. However, I don't think the entire weather system's forecasting model needs to be included as we simply want to cycle through different weather patterns. I don't think letting the player know about the weather forecast on a week-by-week basis is core to the game, but if people want to, they can discuss it below.