Metadata++

* added .k25 thumbnails
* partial help on tagnames (IPTC / IFD0)
* added many Kodak, KodakIFD and JSON tags
* added eBooks thumbnails (aeh, azw, azw3, lit, lrf, rb, snb)
* added XMP-app, XMP-key, XMP-meta
* added VCard meta
* fixed display f HTML-ncc and HTML-dc tags
* added HTML-office tags