Shrimple

• Added support for normal maps (OldPBR or LabPBR).
• Added support for POM (parallax occlusion mapping).
• Added support for emission (hard-coded or LabPbr).
• Added directional light sources (ie furnace, jack-o-lantern, etc).
• Added initial support for PhysicsMod snow.
• Added dynamic lighting for activator/detector/powered rails.
• Added volumetric lighting/fog.
• Improved temporal upscaling filter for block-light shadows.
• Improved compatibility with some older devices (Intel).
• Improved shadow map biasing (/reduced acne).
• Improved ambient lighting for ray-traced block-lighting.
• Fixed tracing of "invisible" walls.
• Fixed beacon-beam lighting.
• Revised option screens.

* For best results, use the latest Iris 1.6.0 beta 3 from the Iris discord.

* This release includes an experimental option for ray-tracing block-lighting with volumetric fog. This is very performance heavy and will likely be replaced with a simplified version in the next release, or removed entirely.