added qse_mbstouri()/qse_wcstouri()/qse_strtouri().

added qse_enbase64()/qse_debase64().
enhanced basic authorization to httpd-std

qse/lib/cmn/htb.c

@@ -274,6 +274,7 @@ htb_t* qse_htb_open (
 		return QSE_NULL;
 	}
 
+	QSE_MEMSET (htb + 1, 0, xtnsize);
 	return htb;
 }