* Lighting now generally consistent with vanilla
Skylight is now dispersed by some blocks, instead of passing
through unimpeded.
Some blocks which were not marked as transparent are now marked as
such.
Water and other such blocks now attenuate light with the correct
intensity.
Generally changes were based on documentation in the Minecraft
Wiki: https://minecraft.gamepedia.com/Opacity#On_block_light ,
however during play-testing on vanilla lava was found not to
attenuate sky or block-light so the attenuation was removed.
This fixes#3849
* Add API documentation for IsSkylightDispersant
* Rename m_SkylightDispersant to m_IsSkylightDispersant
* Update comment for m_Transparent property of Blocks
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