[YM!] Veil Iris Lights Compat (VILC)

Added

• Area-light width, height, and orientation are now transferred into the Iris light pass
• Area lighting now originates from the nearest point on the emitting surface

Changed

• Area-light distance attenuation, surface response, and voxel shadows now use the actual rectangular emitter
• Rectangular and tube-shaped Veil lights retain their spatial extent with shaderpacks enabled

Fixed

• Fixed 180-degree area lights producing a dark directional seam