Added new mobs from 1.18.
Fixes two issues from GitHub:
MyDog supported 1.18 already, but there were some breaking bugs regarding levels, that broke around 1.17 and 1.18.
If it breaks in 1.17, it's most likely due to a bug in Spigot regarding ChunkLoad, where entities are not listed (because they aren't nessecarily loaded together with the chunks), but that's fixed in 1.18, with a new event listener.