Lunar Nether

Added eclipses and overworld phases animation. Fixed physically inaccurate overworld planet animation. Added a new block, Astralith, a very tough stone at the border between the moonstone and netherrack layers. Changed some world gen json to patches for improved mod compatibility. Added a clock for moon phases, made from Titanium. Rebalanced block hardness and blast resistance. Added a new advancement. Several small bug fixes.