add yyPushLexerState and yyPopLexerState functions.  Also update CookCC class for some missing functions.
add yyPushLexerState and yyPopLexerState functions.  Also update CookCC class for some missing functions.
miguel01997/cookcc,coconut2015/cookcc,coconut2015/cookcc,miguel01997/cookcc,coconut2015/cookcc