Solas Shader

Features added/changed:

• Improved SSS
• Improved Aurora Borealis. Tweaked its colors and added variable brightness and detail

Features fixed:

• Fixed NaNs occuring at high altitudes
• Fixed incorrect reflections falloff
• Fixed bloom flickering in dark environments
• Fixed some bugs related to resourcepack skybox support
• Fixed dropped items appearing green with GI enabled
• Fixed incorrect shadow calculations in volumetric clouds ray marcher
• Fixed compilation errors when toggling certain options