Hoarfrost: Snow & Blizzards

Added

• Seven kinds of snowy weather - light snow, snow, heavy snow, heavy snow with large flakes, light blizzard, blizzard and heavy blizzard - each with its own flakes, fall speed, wind, haze and sound, blending into each other.
• A wind that turns and wanders, with gusts and lulls rolling over the land, a boundary layer near the ground, rising over and calm behind obstacles with a back eddy, flowing around them and barely reaching under cover; shared course with Petrichor's rain.
• Simulated flakes (crystals, clumps, grains, streaks in a gale), snow in the middle distance and a stream of flakes past the face in storms.
• Snow on the ground as a smooth surface: drifts in the lee, hollows, swept ridges, even cover under crowns, caps on posts, soft rims, a dusting where little falls, snow blown a few blocks into cave mouths; melts near lamps and in warm land; saved per world.
• Powder blown up by wind charges, explosions, gusts, running and landings, settling slowly.
• Clouds of snow and driving snow dust in heavy snow and blizzards; whiteouts in heavy blizzards.
• Snow on distant land out to the render distance; snow on crowns.
• White leaves in snowy biomes, as in Bedrock Edition.
• No lightning or thunder over snowy land.
• Footprints as soft dents, packed paths.
• Real snow layer drifts built by the server in windy snowfall.
• Light snow keeps the sky its colour; heavy snow and blizzards bring a bright overcast and a cool blue-grey haze, gated to the outdoors.
• Soundscape: silent light snow, breeze, wind, storm roar, howl, passing gusts, muffled indoors; hush of falling snow; snow footsteps.
• Optional Serene Seasons integration.
• The snowy haze works with Distant Horizons and covers its distant land too.
• /hoarfrost weather <kind> [seconds], /hoarfrost weather clear, /hoarfrost status.