Kappa Shader v3.0 Preview T2 (Patreon)

There's been some decent progress on Kappa v3.0 again, including:

- fixed dim emitters in nether (soul fire, magma block etc)
- fixed POM depth slider
- fixed blinding specular highlights on water
- adjusted VPS shadows
- additional settings
- fixed rough reflections threshold sliders
- adjusted default rough reflections threshold