* language_cpp: add back digit separators * language_cpp: rewrite number matching in regex * language_c: port digit separators over from language_cpp (cherry picked from commit 8ea0393800bb59a214e8a6efd5b9fb69282803a9)
* language_cpp: add back digit separators * language_cpp: rewrite number matching in regex * language_c: port digit separators over from language_cpp (cherry picked from commit 8ea0393800bb59a214e8a6efd5b9fb69282803a9)