Twemoji-based clothes

- New Emoji-based shirts based on Twemoji because the idea sounded fun. Credits will eventually be added in-game but for now it's in the README.
- For the time being, a few of the ZC's Dress Up-era shirts have pulled because they were never properly ported over during the remaster.
- The train sweater had it's track logo replaced with the train emoji.
- Removed PNG clothing sprites.
- Version label.

sprites/character_base_head.svg

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