* grammars: reserve rejects & next candidates * grammars: reuse new_stacks * grammars: fix missing sig change in llama.h * grammars: fix test (api changed) * grammars: update gbnf-validator.cpp * grammars: simpler syntax (no swap)
* Revising GBNF validator program to be much simpler. * Changing from streams to using cstdio * Adding final newline character.