Add fuzzing harness #15
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Add a fuzzing harness adapted from the command-line tool. It decodes the input with png crate, encodes it with mtpng, decodes the result with png again and verifies that the decompressed data before and after passing through mtpng is identical.
This is an implementation of #14
So far it's finding bugs in
png, notmtpng: image-rs/image-png#222