Windswept Fantasy Shaders v0.8.3 - Seamless End Sky Default On

Built from the user-supplied v0.8.1 ZIP.

Changes:
- Corrected Nether / End sky handling with Iris dimension.properties.
- Separate full shader program sets for the vanilla Nether and End.
- Overworld only: custom sun, moon, aurora, stars and animated clouds.
- Nether: retain the native Nether sky, lighting and colors; no Overworld sky.
- End: use the seamless procedural purple nebula sky by default; disable fallback to try the native mod sky.
- Optional END_SKY_FALLBACK (1 default; 0 = attempt native End sky)
  for users affected by the separate Iris custom-sky-rendering incompatibility.
- Emissive ores, held light, fancy water, wind and other normal settings remain.
- No shadow maps, black ink outlines, special block highlights or fog options.
- User defaults (max wind, bloom OFF, god rays OFF, custom clouds and aurora) stay unchanged.

The enclosed Better End (4.0.12) and Better Nether (9.0.11) JARs are for Fabric Minecraft 1.20/1.20.1.
Other Minecraft versions need their corresponding mod releases.

Testing (in Minecraft, Iris):
1. Overworld: clouds/aurora should still render like v0.8.1.
2. Nether: no blue Overworld sky, white sun, moon or aurora.
3. The End with or without Better End: seamless procedural purple nebula/stars should appear.
4. To attempt Better End native sky instead, set Dimension Sky Compatibility > End Sky Fallback = 0.
   The shader sky is an approximation, not Better End's exact custom textures.

Known limitation: Iris itself has known incompatibilities with some mod-provided
custom dimension sky renderers. The shader pack cannot guarantee that the original
Better End renderer becomes visible.

No assets or source code from Better End or Better Nether are bundled in this ZIP.
GLSL program compilation / in-game compatibility must be confirmed by the user's client.

Windswept Fantasy v0.8.2.1 - End sky seam fix
- Procedural End sky fallback no longer uses the discontinuous azimuth/atan mapping.
- Nebula and stars instead use continuous world-space direction sampling.
- v0.8.3 enables the seamless fallback by default; players can turn it off.
- No changes to Overworld, Nether, settings, effects or performance profiles.
- Requires Minecraft in-game testing; local GLSL compilation is not a gameplay test.

v0.8.3 release note: Only the End fallback default was changed from 0 to 1.
All visual shader code (including the seam fix), dimension handling, performance presets,
wind settings, cloud/aurora defaults, bloom and god ray defaults remain identical to v0.8.2.1.
