Betty's Better Seasons

1.2.0-1.20.1
New
- Seasonal colours: grass and leaves (birch and spruce too) blend gradually through the year —
  bright green spring, deeper green summer, red-orange autumn, light-blue winter.
  Set per season with "tint" / "tint_strength"; players can turn it off (client config seasonalColors).
- Seasonal weather: it snows all winter. Any season can force "snow", "rain" or "clear" with "weather"
  in its JSON. Server config weather.enabled; doWeatherCycle false locks the weather.
Fixed
- Seasonal crop JSON: "all" / [] / missing seasons now mean year-round; unknown season ids are
  ignored with a warning instead of breaking the entry.
- BetterSeasonsAPI.addEvent / removeEvent now sync to clients.
Notes
- Not network-compatible with 1.1.0: update clients and servers together.
- Snow doesn't pile up on the ground.