Iceology

Changelog:

-Ported to 1.21.5

Additions:

-Added Spawn Egg textures for all Iceology mobs

Fixes:

-Potted cordalbloom no longer emits light

-Potted Cordalbloom now gives proper item when taking the plant

-Cordalbloom now has the correct loot table

-Fixed 'Ice From the Underworld' advancement being misspelled