[YM!] Veil Iris Lights Compat (VILC)

Added

• Performance, Balanced, and High rendering-quality presets.
• Live quality selection in the in-game configuration screen.
• #veil_iris_lights:non_occluding block tag for light-source blocks that should not block their own Veil light.
• Public VeilIrisLightOcclusion registration API for client mods.
• Optional built-in tag entry for yesmenn:colored_light.

Improved

• Reduced the blue-channel brightness advantage with bounded, smooth luminance compensation for more even RGB falloff and better-centered color mixing.
• Cached all fullscreen light-pass uniform locations.
• Reused light upload arrays and shadow normal matrices instead of allocating them repeatedly while rendering.
• Avoided repeated framebuffer completeness checks when the render target has not changed.
• Restored OpenGL texture bindings per texture unit after the light pass.
• Added a lower-cost derivative-normal path for Performance and Balanced modes.
• Reduced normal-depth sampling and disabled voxel tracing in Performance mode.
• Kept all quality presets at the full 48 point-light and 16 area-light limits.
• Dropped stale translated-shader cache references whenever Iris rebuilds its shaderpack pipeline while leaving OpenGL resource ownership to Iris.
• Simplified the translucent dithering patcher and removed unused code paths.
• Reduced routine shader translation messages from info to debug logging.
• Replaced the hard-coded MennURL light-block check with a reusable block tag.

Fixed

• Fixed stale translated shader references accumulating across shaderpack reloads.
• Fixed a native crash during shaderpack switching caused by closing Iris-owned shader programs from the Compat cache.
• Fixed invalid Veil development-resource watch paths spamming startup errors.
• Fixed the active texture unit not always being restored correctly after the shaderpack light pass.
• Fixed excessive blue luminance compensation producing a visibly larger blue falloff and shifting cyan transitions toward green.
• Restored Veil's camera-centered voxel shadow grid so visible walls and surfaces receive consistent occlusion from all nearby light sources.
• Traced distant light rays through the known section of the voxel grid without abruptly suppressing lights outside its finite range.
• Kept the existing multiplicative shaderpack light compositing to avoid over-brightening shaderpack output.
• Kept lights visible without temporary occlusion only while Veil is actively rebuilding its voxel shadow grid.