Builder's QOL Shaders

• All: Updated to MC 1.20.3, which renamed "grass" to "short_grass".
• All: Lava overlay no longer applies in spectator mode (iris only).
• All: Added slider for amount of refraction to apply to water.
• All: Many Y level-related effects now adjust to the height of the world automatically (iris 1.6+ only).
• All: Smoothened out noise on lava when "randomize lava brightness" is enabled.
• All: Overworld and end now respect vanilla fog distances. This should hopefully improve compatibility with mods which change how fog works. The fog density curve remains unchanged.
• All: Re-added support for the twilight forest after it broke in MC 1.16 (iris 1.6.5+ only)

* All: Lightning now illuminates the clouds (Iris only).
* All: Changed overworld fog density curve, and added a new config option to control part of it.
* All: Wet dirt now affects coarse dirt, rooted dirt, and podzol.
* All: Added waving leaves support for azalea and mangrove leaves.
* All: Added sliders for sky and horizon saturation in the overworld.
* All: Added support for the darkness effect.