Use Win32 APIs for UTF-16<->UTF-8 conversion

std::codecvt is deprecated since C++17 and broken for some characters/locales

src/platform/windows/misc.h

@@ -20,4 +20,20 @@ namespace platf {
 
   std::chrono::nanoseconds
   qpc_time_difference(int64_t performance_counter1, int64_t performance_counter2);
+
+  /**
+   * @brief Converts a UTF-8 string into a UTF-16 wide string.
+   * @param string The UTF-8 string.
+   * @return The converted UTF-16 wide string.
+   */
+  std::wstring
+  from_utf8(const std::string &string);
+
+  /**
+   * @brief Converts a UTF-16 wide string into a UTF-8 string.
+   * @param string The UTF-16 wide string.
+   * @return The converted UTF-8 string.
+   */
+  std::string
+  to_utf8(const std::wstring &string);
 }  // namespace platf