Kappa Shader v4.1 Preview E2

Oi folks, time for another update

Also lil' status update on my end (if you remember the latest vanilla plus post): Things might go back to normal of sorts soonish, so I hope I can pick up at a reasonable pace again :)

Changelog:

- adjusted atmosphere coefficients
- fixed disabling labPBR emission
- tonemap adjustments
- minor taa improvements
- adjusted skylight
- improved sky projection
- improved reflection capture behavior
- minor performance gains when using cloud shadows

As always, enjoy the update!