The source project of this merge request has been removed.
Remove the definition of the image/avif-sequence MIME type.
More info: https://github.com/AOMediaCodec/av1-avif/pull/86
Updated specification draft: https://aomediacodec.github.io/av1-avif/
Instead of two mime types image/avif and image/avif-sequence only one image/avif will be used.
So I merged these two into one image/avif.
Magic detection is more specific now, avoid false positives on some HEIC files.