Solas Shader

Features added/changed:

+ Added generated noise texture to Distant Horizons LOD blocks
+ Added subtle flickering to emissive flowers
+ Improved clouds shape and lighting
+ Modified exponential and LPV fog

Features fixed:

Fixed some compilation errors when toggling various options, mostly Post Effects
Fixed some issues with Distant Horizons
Fixed NaN errors on cloud shadows
Fixed performance losses in Overworld and slightly improved FPS
Fixed some blocks not being reflective with IPBR