Nostalgia Shader v3.1 Preview T1

Oi folks,

time for a preview out of the blue since I almost forgot about the polishment patch for Nostalgia Shader.

Changelog:

- fixed missing water absorption on objects using subsurface scattering
- added moonlight illumination setting
- fixed cloud blending when above first layer
- color settings for nether and end
- improved caustics
- tonemap tweaks