The Xerces dependency is old, broken, and unnecessary

[ndw]

Jing/Trang include a depenency on XercesImpl 2.9.1. That's old and contains a bug that causes an index-out-of-bounds exception on (some?) UTF-16 filesystems (like Windows?). AFAICT, a more modern Xerces implementation ships with JDK 9+ so it's probably time to remove that dependency.

If it can't be removed, I assume (but haven't checked) that the bug is fixed in more modern Xerces implementations, such as 2.12.x.