Allow eww to display exotic images like webp
* lisp/image.el (image-type): Allow passing in the image type. (create-image): Make conversion work with data in addition to files. * lisp/image/image-converter.el (image-convert-p): Allow taking working on data in addition to files (bug#38036). (image-convert): Ditto. (image-converter--convert): Extend signature to say whether we're getting a file or data. (image-converter--convert-magick): Convert data. (image-converter--convert): Ditto.
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