Skylight Hooks for Minecraft Forge

World Hooks on sky light, which can provide sunlight / moon factor from the Worldprovider.
mainly for Solar/Lunar Eclipse.

getSunBrightnessFactor is for getting sun brightness, i think it is better than just using getCelestialAngle.. I don't see any problem on it.
I can redirect the World#calculateSkyLightSubtracted, but I think there is some problem
for It is "subtracted" light value from full. Am I supposed to just redirect it?
Of course I can map it onto [0.0f, 1.0f], but the World#calculateSkyLightSubtracted has the process which gives value [0.0f, 1.0f] already, so I copied it.
whi