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/dnn/utils/inference_engine.hpp

@@ -0,0 +1,43 @@
+// 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) 2018-2019, Intel Corporation, all rights reserved.
+// Third party copyrights are property of their respective owners.
+
+#ifndef OPENCV_DNN_UTILS_INF_ENGINE_HPP
+#define OPENCV_DNN_UTILS_INF_ENGINE_HPP
+
+#include "../dnn.hpp"
+
+namespace cv { namespace dnn {
+CV__DNN_INLINE_NS_BEGIN
+
+
+/** @brief Release a Myriad device (binded by OpenCV).
+ *
+ * Single Myriad device cannot be shared across multiple processes which uses
+ * Inference Engine's Myriad plugin.
+ */
+CV_EXPORTS_W void resetMyriadDevice();
+
+
+/* Values for 'OPENCV_DNN_IE_VPU_TYPE' parameter */
+#define CV_DNN_INFERENCE_ENGINE_VPU_TYPE_UNSPECIFIED ""
+/// Intel(R) Movidius(TM) Neural Compute Stick, NCS (USB 03e7:2150), Myriad2 (https://software.intel.com/en-us/movidius-ncs)
+#define CV_DNN_INFERENCE_ENGINE_VPU_TYPE_MYRIAD_2 "Myriad2"
+/// Intel(R) Neural Compute Stick 2, NCS2 (USB 03e7:2485), MyriadX (https://software.intel.com/ru-ru/neural-compute-stick)
+#define CV_DNN_INFERENCE_ENGINE_VPU_TYPE_MYRIAD_X "MyriadX"
+
+
+/** @brief Returns Inference Engine VPU type.
+ *
+ * See values of `CV_DNN_INFERENCE_ENGINE_VPU_TYPE_*` macros.
+ */
+CV_EXPORTS_W cv::String getInferenceEngineVPUType();
+
+
+CV__DNN_INLINE_NS_END
+}} // namespace
+
+#endif // OPENCV_DNN_UTILS_INF_ENGINE_HPP