Switch submodule to https://github.com/capnm/Khronos_XML_API
Add support for GL 4.5
Registry now directly reads from the File instead of a buffer
Merge pull request #138 from tomaka/fix-89

Switch submodule to https://github.com/capnm/Khronos_XML_API
Merge pull request #139 from tomaka/direct-reading-file

Registry now directly reads from the File instead of a buffer