Emojis shouldn't be scaled

[Nerixyz]

Checklist

• I'm reporting a problem with Chatterino
• I've verified that I'm running the most recent nightly build or stable release
• I've looked for my problem on the wiki
• I've searched the issues and pull requests for similar looking reports

Describe your issue

Currently, we scale emojis down from 64x64 to (about) 22x22. Downscaling is pretty bad with Qt (yes, even when SmoothPixmapTransform is enabled). We shouldn't have to do that since we (not really we, but pajlada) provide the emojis. We should scale the emojis once to the desired size(s) and distribute these. emoji-data provides a good foundation for this (imgmagik → zopfli).

Screenshots

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OS and Chatterino Version