OPAL Shaders

OPAL v0.2.0 Changelog:

Caves:
-added "Per Biome Cave Fog" option
-added sliders for adjusting the colors and density of fog in Caves, Lush Caves, Dripstone Caves and Deep Dark
-changed the colors of cave fog in Lush Caves and Deep Dark
-increased the fog density in Lush Caves, Dripstone Caves and Deep Dark

Foliage (and few other things):
-added "Windy Caves" option
-caves are no longer windy by default
-added "Underwater Waving Strength" option
-decreased waving speed of underwater foliage
-increased waving strength of underwater foliage
-increased waving strength during all weather events
-decreased waving strength of tall flowers and vines
-saplings are now waving
-decreased brightness of: saplings, flowers, tall flowers, cave vines, dripleafs, cobwebs
-improved subsurface scattering (it's smoother now)

Emissive Textures:
-improved emissive textures of: experience orb, glowsquid, allay, vex, warden, enderman, ender dragon, wither, wither skull, blaze
-improved emissive textures of campfires (the flames are brighter, the logs are darker)

Fixes:
-fixed cave fog being influenced by the weather
-fixed glowsquid, allay and vex color being influenced by the time of day and light level
-fixed hand detection for emissive items
-fixed bad desaturation transition around blocklights during weather events
-fixed "holes" in powdered snow
-fixed incorrect mapping of foliage and emissive textures in Minecraft versions earlier than 1.13