-Added LightEntity, InteriorLightEntity, and ReflectorLightEntity

-Added GetEntry() method to BaseObjectManager  to retrieve single entries
-Added GetCubeBlock() method to CubeGridEntity to retrieve single cube blocks
-Changed manager indexing of cube blocks from entity id to a packed block position value
Merge branch 'master' of https://github.com/SEModCommunity/SE-Community-Mod-API