Patch Notes: Less rain, and lighter rain

Weather

• It rains about half as often. A woodland spring used to be wet a third of the time; now it's about one hour in six. The hours it no longer rains are that region's usual dry weather: sun, cloud, the grey deck and fog.
• Rain now comes in every strength. Each rain front has its own: about a third are a light sprinkle from edge to middle, most are a steady shower, and only about a quarter build to a downpour at their heart. Walking into a front still starts light at its edge.
• Thunderstorms are still downpours, but they come half as often.
• The Classic skin's weather, and the classic weather you get with "Weather as places" turned off, are unchanged.

What's Changed

• RAIN-HOURS + RAIN-HEART: it rains half as often, and a rain front can be a sprinkle by @Lattymoy in #866

Full Changelog: app-v0.1.8438...app-v0.1.8445