Kappa v3.0 Preview E11

I usually try to release all preview versions at the start of the month because of the charge upfront thing, but I couldn't really wait another week now (due to some background prep happening for the next pack going through a rewrite, details soon) so here it is now.

Changelog:

- minor adjustments to sky and atmosphere
- adjusted default gamma
- added support for labPBR material AO
- workaround for bright spots on "Impossible" normals
- workaround for black metals when reflecting the night sky
- improved weather support (no rain particles on regular kappa yet)
- added settings profiles