* some adaptions to test and comparator
* minor fix in mappings for ncong
* introduce a LaTeXML Fallback for the tex-cases:
** "\ce{\ca}"
** "\mod"
Bug: T327392
Change-Id: Ie2efa392bd517a28fe8b6e8d0cecdba64cd1c415
* For MMLGenTexVCUtilTest and the MMLComparator
* Also skip some inputs which are not supported
Bug: T327392
Change-Id: Ifac913e2b8e4c70c7222f769c0e7cf93e65de5b8