Released v1.4.0.
* Due to breaking ABI the soname version has been bumped to 5.0.0.
* Default symbol visibility is now "hidden", reducing binary size.
* Converted some things pointed out by cppcheck & clang-tidy to
C++11.
* Fixed a lot of issues pointed out by clang-tidy.
* Added a function "ForceNoDefault" in the "EbmlElement" class.
* Added a function "OverwriteData" in the "EbmlElement" class to
complement the existing "OverwriteHead" function.
* Fixed compilation on Windows wrt. winapifamily.h
* Fixed compilation on Haiku.
* A C++11 compliant compiler is now required. Several of its
features are now used in the source.
* EbmlElement::FindNextElement: fixed a buffer overflow on the
stack by one byte when the first byte read had its upper four bits
unset.
* EbmlCrc32: added a explicit assignment operator with default
implementation as an explicit copy constructor exists (implicit
assignment operators are deprecated in such cases).
* When reading binary elements with a size of 0, the element was
skipped by libebml instead of returned to the calling function.
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