Do not assume urlPtrPos is just after mimeList when reading it #630
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This PR is a fix for #628 and #629 (partially) and #621 . It restores the ability of the app to read the MIME type list in newer ZIMs which have relocated the urlPtrPos to the end of the archive. The same solution has been adopted in libZim - see openzim/libzim#353. The solution is to limit the maximum size of the slice being searched for the MIME type list to 1024 bytes. If the ZIM reports it as being less than that, then the lower value is accepted.