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f6b99171ce
We thumbnail and serve emoji with the same format as they were uploaded. However, we preserved the original extension, which might mismatch with the provided content-type. Limit the content-type to a subset which is both (a) an image format we can thumbnail, and (b) a media format which is widely-enough supported that we are willing to provide it to all browsers. This prevents uploading a `.tiff` emoji, for instance. Based on this limited content-type, we then reverse to find the reasonable extension to use when storing it. This is particularly important because the local file storage uses the file extension to choose what content-type to re-serve the emoji as. This does nothing for existing emoji, which may have odd or missing file extensions.