Slow xdxf converter

[ritou11]

Now the xslt-ts used to convert xdxf is too slow... about 100ms per entry. In Python, lxml is 20 times faster than this.
Anyone with a xdxf dictionary should consider pyglossary. Though it is a bit complicated, the outcome is better than this repo.
Improvement scheduled in the future. Perhaps when a better xslt processer comes out for Node.js. Or just write some Python scripts for pyglossary.