Patch Notes: Snow, Wind and Heat Haze

Snow you walk through

In winter, outside the deserts, real snow now lies on the ground, deeper in the wild than in towns. It builds up while snow falls and melts back in clear weather.
You, monsters, guards and townsfolk leave tracks in it. Tracks slowly fill back in, faster while it snows, and they are kept in your save.
A fallen enemy leaves a hollow in the snow where it lay.
With Basic Roads, its paths and tracks keep only a thin layer of snow, and its main roads get a bank of snow along their edges.
The winter ground under it has new textures.

Wind now changes from day to day. Trees and plants sway and shiver, some days turn windy or stormy, and gusts come and go with their own sound.
Leaves blow off the trees, and in winter snow blows off the boughs.
The wind waits while the game is paused.

In the deserts by day, the distant land and sky shimmer in the heat: fully under a clear sky, half as much under cloud, fading in after sunrise and out before sunset.

All of it is on by default in the enhanced outdoors. Snowfall, Windfall and Heat Haze each have their own switch in Features; the desert sand and the winter ground are packs of their own on the Replacement packs card.

Snowfall, Windfall, Heat Haze and Sands of the Alik'r - ported, audited and made cheaper (ALIKR1, HAZE1, WINDFALL1, SNOWFALL1, AUDIT ENVIRONS) by @Lattymoy in #692

Full Changelog: app-v0.1.6988...app-v0.1.6998