Weather

Making weather.

ready:
 1. using dynamic heatmap for water freeze and ice melting (season change)
 2. lua api for get-change level of water, snow

minetest_game here - https://github.com/proller/minetest_game/tree/weather
rain, snow, evaporate as mod here - https://github.com/proller/minetest-mod-weather/tree/weather

todo: 
 rain, snow, evaporate strength depend on heat-humidity
 fog depend on humidity

enabling:
weather = 1
liquid_finite = 1