Rename base64.{cpp.h} to str_util

src/str_util.h

@@ -0,0 +1,13 @@
+// Copyright (c) Vitaliy Filippov, 2019+
+// License: VNPL-1.1 (see README.md for details)
+
+#pragma once
+#include <stdint.h>
+#include <string>
+
+std::string base64_encode(const std::string &in);
+std::string base64_decode(const std::string &in);
+uint64_t parse_size(std::string size_str);
+uint64_t stoull_full(const std::string & str, int base = 0);
+std::string format_size(uint64_t size, bool nobytes = false);
+void print_help(const char *help_text, std::string exe_name, std::string cmd, bool all);