Iron's Spells Mob Type Fix

A simple mod that fixes the issue where some creatures in Iron's Spells 'n Spellbooks were not properly tagged

Add the tags "undead", "burn_in_daylight",  "skeletons" to Necromancer, so that it can be correctly identified as an undead creature and will spontaneously combust in sunlight.

Also, fix its animation during self-healing, replacing the healing potion held in Necromancer's hand with a damage potion. 

Add the tag "undead" to Dead King and Dead King Corpse, so that they can be correctly identified as undead creatures. 

Add the tag "arthropod" to Ice Spider, so that it can be correctly identified as an arthropod creature. 

Add the tags "illager", "illager_friends",  "raiders" to Archevoker, so that it will now actively attack villagers and wandering trader, who will also attempt to flee from Archevoker