Metadata++

* dark mode * 64 bits C++17 * fixed writing of XMP-GettyImages * added printing of thumbails/metadata to printer or PDF or XPS * added previews for Canon, CanonRaw, Quicktime, Track1, MPImage2, ORI * added few Canon tags * display FFF, IIQ * added JPEG-JUMBF, QPTIFF, JPEG-XL * added some MXF, Trac6, Track7 tags