added QSE_XLI_STRTAG and changed related functions and defintions

qse/lib/xli/err.c

@@ -45,8 +45,10 @@ const qse_char_t* qse_xli_dflerrstr (
 		QSE_T("right-brace expected in place of '${0}'"),
 		QSE_T("pair value expected in place of '${0}'"),
 		QSE_T("string not closed"),
+		QSE_T("string tag not closed"),
 		QSE_T("'@include' not followed by a string"),
 		QSE_T("invalid character '${0}'"),
+		QSE_T("invalid tag character '${0}'"),
 		QSE_T("'${0}' not recognized"),
 		QSE_T("@ not followed by a valid word"),
 		QSE_T("invalid identifier '${0}'"),