Add magic for Kobo e-book reader
Add another magic match for EPub books
Add missing globs and tests for OpenPGP files

Unfortunately, it looks very hard to differentiate between various OpenPGP
(RFC 4880) packets in binary form. Most files end up getting compressed packets
(e.g. 0x88 as first byte) and then more logic is needed to determine what the
content might be about.

https://bugs.freedesktop.org/show_bug.cgi?id=65679
Add MIME types for raw disk images

https://bugs.freedesktop.org/show_bug.cgi?id=64845