More work toward getting Ogerpon's unique Terastal forms functional. Also fixes the graphics for the Terastal Ogerpon forms, as they were scaled incorrectly.
This implements Chilling Neigh, Grim Neigh, and both As One abilities.
Also separates the Embody Aspect ability into four for later when it's implemented, and adds the graphics for Ogerpon's Terastallized forms.