Solas Shader

Features added/changed:

+ Rewrote and improved volumetric lighting, LPV fog, Nether smoke and volumetric fireflies
+ Added an additional low frequency noise octave to volumetric clouds noise sampler. It allows for even more variety in shapes and sizes
+ Implemented new logic for LPV fog. It can now appear during daytime once again and isn't as strong as before
+ Nether Smoke now appears as long wavy streams coming from the ground up
+ Made Aurora Borealis more physically accurate and randomized
+ Adjusted atmosphere and exponential fog lighting
+ Added target block to iPBR emission. It now glows red when shot

Features fixed:

Fixed particles being invisible on 1.21.5 and above
Fixed LPV fog overexposure and flickering
Fixed several compilation errors

Features removed:

- Temporarily removed cloudy noise from LPV fog. It will be re-added in the next update