Simple mod to make the workbench background dark gray, for all those late-night stormworks sessions

Changelog:
7/7/25 6:54
fixed sky being black near 12 (nevermind, I guess I didnt lol)
7/8/25 1:24
hopefully made it actually work more reliably
Common Problems
Nothing Changes
Sky Is Black Near Noon
these can mostly be solved by changing the number at the end of
step(distance(normalize(sun_light_direction), editor_sun), 0.004);
in the contained shader file. the "correct" value will be different for most people.
