- Seeded weather (clear/cloudy/rain/storm, snow and blizzards on cold days
and above the snowline), lightning, synthesised rain/wind/thunder sound
- Rain/snow particles stopped by roofs; wet ground, settled snow and wind
via global shader uniforms
- Snap-together wood floor, wall, door, roof and gable with structural
support, collapse and X to dismantle
- Shelter detection: dry under a roof, warmer and Rested inside with a fire;
rain burns an uncovered campfire faster
- Bed sets the spawn point and lets you sleep through the night
- Trees, boulders and ground pickups regrow; timers saved
- Grass cleared under floors; shorter HUD hint
- New test_weather_building suite (62 checks) and tests/run_all.sh, which
also fails on script errors
