Add multi-frame handling.

- Exif of all frames are displayed in the Editor's Exif tab (without
separator)
- isHDR and isPixelShift is added to the data files stored in cache
- In the Editor panel, the QuickInfo frame display the HDR and
PixelShift information, as well as the number of frame and bit-depth for
HDR image
- the number of frame is provided by dcraw. If not set, it is provided
by the Exif's main IFD count
- the PixelShift information (for Pentax as of now) is provided by
looking at the Exif informations
- the HDR information is provided by the Exif information of the first
frame for Pentax raw files, or by the bitspersample, sampleformat and
compression tags for other files

TODO: add icons to the thumbnails to tag HDR and PixelShift files.

rtexif/stdattribs.cc

@@ -539,6 +539,7 @@ const TagAttrib exifAttribs[] = {
     {0, AC_SYSTEM,    0, nullptr, 0x0101, AUTO, "ImageHeight", &stdInterpreter},
     {0, AC_SYSTEM,    0, nullptr, 0x0102, AUTO, "BitsPerSample", &stdInterpreter},
     {0, AC_SYSTEM,    0, nullptr, 0x0103, AUTO, "Compression", &compressionInterpreter},
+    {0, AC_SYSTEM,    0, nullptr, 0x0153, AUTO, "SampleFormat", &stdInterpreter},
     {0, AC_WRITE,     0, nullptr, 0x828d, AUTO, "CFAPatternDim", &stdInterpreter},
     {0, AC_WRITE,     0, nullptr, 0x828e, AUTO, "CFAPattern", &cfaInterpreter},
     {0, AC_WRITE,     0, nullptr, 0x829A, AUTO, "ExposureTime", &exposureTimeInterpreter},
@@ -777,6 +778,7 @@ const TagAttrib ifdAttribs[] = {
     {0, AC_SYSTEM,    0, nullptr, 0x013E, AUTO, "WhitePoint", &stdInterpreter},
     {0, AC_SYSTEM,    0, nullptr, 0x013F, AUTO, "PriomaryChromaticities", &stdInterpreter},
     {0, AC_WRITE,     0, ifdAttribs, 0x014A, AUTO, "SubIFD", &stdInterpreter},
+    {0, AC_SYSTEM,    0, nullptr, 0x0153, AUTO, "SampleFormat", &stdInterpreter},
     {0, AC_SYSTEM,    0, nullptr, 0x0201, AUTO, "JPEGInterchangeFormat", &stdInterpreter},
     {0, AC_SYSTEM,    0, nullptr, 0x0202, AUTO, "JPEGInterchangeFormatLength", &stdInterpreter},
     {0, AC_SYSTEM,    0, nullptr, 0x0211, AUTO, "YCbCrCoefficients", &stdInterpreter},