Use \r\n for log messages, for terminal apps

src/log.c

@@ -48,7 +48,7 @@ void mg_log(const char *fmt, ...) {
   va_start(ap, fmt);
   mg_vxprintf(s_log_func, s_log_func_param, fmt, &ap);
   va_end(ap);
-  logc((unsigned char) '\n');
+  logs("\r\n", 2);
 }
 
 static unsigned char nibble(unsigned c) {