Mob AI Tweaks

-Fixed a crash related to Piglins acquiring their targets for the first time in a world.

-Fixed "Apparitions Stalk the Night" advancement being missing.

-Fixed Strays getting stuck during their special attack, causing them to glide on the floor and spam snowballs.

-Fixed Skeleton's arms behaving incorrectly when using a bow.

-Switched to Mojang Mappings for the eventual deobfuscation of Minecraft's code by 2026 and as well as to be ported to 1.21.11 with much ease. Be sure to report if this conversion ended up breaking something. This is also done so I can eventually convert the mod into multiloader via Architectury API to allow the mod to work on NeoForge on versions without Sinytra.