feat(seasonal): Implement Snowball

Adds the snowball from Winter 2014 to the Seasonal Shop.
WIP(NYE): New Year's cards
feat(NYE): New Year's cards
fix(NYE): I18N for random text
feat(NYE): Migrate hats
chore(news): Bailey
Merge pull request #4452 from SabreCat/nye

New Year's event features