The Faster Update (v3.0) for Minecraft 1.20.2

This is a forward port of v3.0 for Minecraft 1.20.2. Changelog for v3.0 is included for reference:

• Game performance is greatly improved, thanks to some serious debugging and innovation from @cafuneandchill and @embeddedt.
  • Note: A side effect of the new technique will be that mobs produce puffs of smoke upon disappearing. This is arguably less jarring than the blipping mobs of before, but perhaps more noticable.
• Enderman no longer make teleport sounds in the rain before being removed, at least under normal spawning circumstances. Thanks to @vinnyg0621 for reporting this. (The fix was courtesy the improvement to despawning in the prior bullet point.)
• Control Slimes and Magma Cubes separately with spawnSlimes rule. This allows players to have small slimes and magma cubes again for feeding frogs (1.19 or later), or just as pets (all versions), without having to tolerate undead mobs.
• Control overworld undead mobs with spawnUndead instead of old spawnMonster rule. (Slimes were split out.)
• Magma Cubes are no longer controlled with spawnNetherMonsters (see spawnSlimes instead.)

We've decided not to provide mob suppression for the Warden. You can still turn it off via the vanilla command /gamerule doWardenSpawn false. Additionally, we will not be providing a mob-free recipe for froglights. The reasons for both of these decisions are in the README.