Exiv2

1/ Binary wheels incorporate libexiv2 v0.28.4.
2/ Fix TimeValue test when run with local negative UTC offset.

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* Exiv2 library
- 0000560: [xmp] Can't delete (last) XMP tag. (Reported by SerGioGioGio)
- 0000559: [exif] Crash when extracting Exif orientation flag from Kodak
DCR raw file. (Reported by Gilles Caulier)
- 0000558: [jpeg i/o] "Warning: JPEG format error, rc = 5" for most of my
JPEG files. (Reported with patch by Marcus Holland-Moritz)
- 0000552: [build environment] Build failure under Mac OS X 10.3.9
(Reported by Marius Schamschula)
- [exif] Fixed several potential division by 0 bugs.

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* Exiv2 utility
- [tools] exiv2 now writes a proper XMP sidecar file (it used to
just dump the XMP packet to a file).
- [tools] exiv2 can now also save Exif and IPTC data in the XMP
sidecar file (conversion of Exif/IPTC to/from XMP).

* Exiv2 library
- 0000550: [design] Remove "MakerTagInfo registry" and registration logic.
- 0000547: [build environment] exiv2 0.16 fails to compile with gcc 4.3.0.
- 0000546: [exif] Exiv2 crashes while converting Nikon lens information
for pretty printing.
- 0000541: [translation] French translation mistake.
- 0000540: [xmp] Pretty-print functionality for XMP.
(Adrien Bustany for GHOP 98)
- 0000539: [xmp] Cannot add XMP properties in a custom namespace.
(Vladimir Nadvornik, S M Ryan)
- 0000532: [xmp] Added conversions to and from XMP. (Vladimir Nadvornik)
- 0000474: [design] Add a metadatum member to access translated tag values
without the need to use streams.
- [metadata] Added read support for jp2 and psd images, stubs for
gif, bmp and tga images, and pixelWidth and pixelHeight methods on
class Image. (Marco Piovanelli - Ovolab)
- [exif] Updated Nikon lens info to v3.18 of Robert Rottmerhusen's
lens database.
- [exif] Updated Pentax makernote tags. (Michal Čihař)
- [xmp] Added support for XMP sidecar files.
- [xmp] Improved XMP value toLong, toFloat and toRational using new
functions parseLong, parseFloat and parseRational.
(Vladimir Nadvornik)
- [xmp] Allow format options for XmpParser::encode.
(Vladimir Nadvornik)
- [xmp] Added LangAltValue::toString(const std::string&) to get
the value for a specific language qualifier.
(suggested by Marco Piovanelli)
- [xmp] Fixed XmpKey::tagLabel() for custom keys.
(Reported by Vladimir Nadvornik)
- [miscellaneous] Define pid_t using a typedef instead of define in
Windows environments. (Robin Mills)
- [translation] Updated German translation.
(Oliver Dörr)
- [translation] Updated French translation.
(Fabien Salvi)
- [translation] Updated Polish translation.
(Piotr Eljasiak)
- [translation] Updated Russian translation.
(Alexandre Prokoudine)
- [translation] Added Slovak translation.
(helix84)

1/ API change: derived classes of BasicIo are omitted from Python.
2/ Binary wheels incorporate libexiv2 v0.28.3.
3/ enableBMFF() function is deprecated.
4/ Documentation is available on https://python-exiv2.readthedocs.io/
5/ Improved handling of Windows code page character sets.

1/ Binary wheels incorporate libexiv2 v0.28.2.

1/ Removed AnyError alias of Exiv2Error exception.
2/ Metadatum.print() method is no longer renamed to _print.
3/ Improved handling of enums:
1/ Enum results are returned as Python enum instead of int.
2/ Passing ints as enum parameters is deprecated.
4/ Added dict-like behaviour to "data" structs.
5/ Log handlers can be set/cleared from Python.
6/ Made docs available on readthedocs.org
7/ SWIG v4.1.0 or later required to run SWIG.
8/ Binary wheels incorporate libexiv2 v0.27.7.