Updating OpenFace to version 2.2.0 (#741)

Change log:

Moving to C++17. This means that the code can only be build using C++17 compilers (e.g. g++ >8 and Visual Studio 2017, clang > 5), fixing related bugs - (#698, #629, #641)
Removing an explicit dependency on boost (all the filesystem operations are performed using std::filesystem or boost::filesysteme). If boost is available it will used boost:filesystem, otherwise std::filesystem (this requires C++17)
Visual Studio 2017 is now the main version for Visual Studio builds, VS 2015 is no longer supported
Updating OpenCV to 4.1 version (#511)
Fixing a bug with output images when using GUI (#694)
Updating RAWImage - #609, so it can be initialized from System.Drawing.Bitmap directly
Fixing overlap detection for multi face tracking (#693)

lib/3rdParty/OpenCV/include/opencv2/gapi/util/throw.hpp

@@ -0,0 +1,36 @@
+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at http://opencv.org/license.html.
+//
+// Copyright (C) 2018 Intel Corporation
+
+
+#ifndef OPENCV_GAPI_UTIL_THROW_HPP
+#define OPENCV_GAPI_UTIL_THROW_HPP
+
+#include <utility>  // std::forward
+
+#if !defined(__EXCEPTIONS)
+#include <stdlib.h>
+#include <stdio.h>
+#endif
+
+namespace cv
+{
+namespace util
+{
+template <class ExceptionType>
+[[noreturn]] void throw_error(ExceptionType &&e)
+{
+#if defined(__EXCEPTIONS) || defined(_CPPUNWIND)
+    throw std::forward<ExceptionType>(e);
+#else
+    fprintf(stderr, "An exception thrown! %s\n" , e.what());
+    fflush(stderr);
+    abort();
+#endif
+}
+} // namespace util
+} // namespace cv
+
+#endif // OPENCV_GAPI_UTIL_THROW_HPP