Reverted monogod skyboxes, pending for a better solution

Fixed an issue showing sslanesh terrain effect on Skaven corruption

-Fixed wrong lighting in one specific type of Dwarfs tunnel map.

Minor changes.

Removed rainbow colors from corruption skyboxes.

- Highly reduced the amount of night battles in corruption

- Replaced night skyboxes with higher quality ones

- Increased the brightness of night battles

- Increased the brightness of cloudy weather

- Increased the britghness of afternoon weather

- Removed ground maggots from Nurgle corruption cause glitching in snow maps

Adjusted LUT for sunny days so that units get properly shadowed when not facing the sunlight.

-Changed Sylvania night starry skybox with a cloudy and more thematic one

-Slighy decreased Sylvania grass brightness

-Reduced the amount of falling snow in snow regions when they have blue sky day weather.

-Added back a low percentage of Horizon Blur after removing that entirely

-Slighty increased the brightness for Monogods corruption

-Increased the brightness for the Arnheim map

-Decreased the brightness for Darklands grass

-Added Chaos Realms Skyboxes for Wastelands when corrupted