Depths Update

• added algorithmically generated amethyst geodes
• updated amethyst clusters/buds logic
• added post-gen aquifers (turned off by default - experimental)
• added spyglass and its recipe
• added mod icon and update url
• changed chunk section storage to be vanilla aligned
• attempted Celeritas compat
• attempted Nothirium compat
• refactored asset handling and registry
• fixed mobs (not) spawning below level y=0
• fixed lava generation bug (inconsistency in lava level generation)
• fixed mod not being deterministic in some places (ignoring world seed)
• fixed deepslate being normal block instead of pillar
• updated gradle
• license is now in jar

probably breaks old worlds