This applies only to Windows and Linux builds. On macOS, there is a lack of support
for C++17 standard library features in XCode10, and so builds here are set to use
C++14 and the Boost libraries.

* Replace boost::filesystem and boost::system::error_code with std::filesystem and
  std::error_code.
  
* Replace std::uncaught_exception() with std::uncaught_exceptions().