Monsters Level Up

Additions: -Frostbitten -Chinese translation

Changes: -Slimes now spawn poison clouds when jumping at stage 1 and above -Mobs' shields can now be put on cooldown when hit with an axe -Mobs can now use enderpearls -Renamed Zombie Dolphin to Zolphin

Fixes: -Skeleton Commanders and Zombie Juggernauts spawning in caves -Skeletons switching weapons while riding spiders -Zombie Dolphin not spawning naturally