Implement more stat-boosting abilities

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.

public/images/pokemon/shiny/1017-cornerstone-mask-tera.json

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public/images/pokemon/shiny/1017-hearthflame-mask-tera.json

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public/images/pokemon/shiny/1017-teal-mask-tera.json

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public/images/pokemon/shiny/1017-wellspring-mask-tera.json

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