Exiv2

1/ Fix crash when using localised exceptions on Windows.

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.

1/ Binary wheels incorporate libexiv2 v0.27.7.

1/ Binary wheels incorporate libexiv2 v0.28.1.
2/ Include native language support in Windows binary wheel builds.
3/ API change: DateValue.getDate() returns Python dict.
4/ API change: TimeValue.getTime() returns Python dict.
5/ Deprecated: exiv2.Date and exiv2.Time objects.
6/ Added buffer interface to PreviewImage
7/ Set datum value from Python object directly instead of via string.
8/ Moved Position enum to BasicIo class.
9/ Moved CharsetId enum to CommentValue class.
10/ Moved XmpArrayType and XmpStruct enums to XmpValue class.
11/ Added enums for LogMsg.Level
12/ More exiv2 structs are iterable for easy conversion to Python dict.