Merge branch 'GUI' of https://gitlab.inria.fr/wvantoll/UMANS-Fork into GUI

src/Engine/tools/HelperFunctions.cpp

 /* UMANS: Unified Microscopic Agent Navigation Simulator
-** Copyright (C) 2018-2020  Inria Rennes Bretagne Atlantique - Rainbow - Julien Pettr
+** Copyright (C) 2018-2020  Inria Rennes Bretagne Atlantique - Rainbow - Julien Pettr�
 **
 ** This program is free software: you can redistribute it and/or modify
 ** it under the terms of the GNU General Public License as published by
@@ -26,6 +26,9 @@
 
 #if defined(_WIN32)
 #include <direct.h>
+#else
+#include <sys/stat.h>
+#include <math.h>       /* fmod */
 #endif
 
 namespace HelperFunctions

src/Engine/tools/HelperFunctions.h

 /* UMANS: Unified Microscopic Agent Navigation Simulator
-** Copyright (C) 2018-2020  Inria Rennes Bretagne Atlantique - Rainbow - Julien Pettr
+** Copyright (C) 2018-2020  Inria Rennes Bretagne Atlantique - Rainbow - Julien Pettr�
 **
 ** This program is free software: you can redistribute it and/or modify
 ** it under the terms of the GNU General Public License as published by
@@ -28,8 +28,7 @@
 
 namespace HelperFunctions
 {
-	typedef std::chrono::time_point<std::chrono::steady_clock> Timestamp;
-
+	typedef std::chrono::time_point<std::chrono::high_resolution_clock> Timestamp;
 	Timestamp GetCurrentTime();
 	double GetIntervalMilliseconds(const Timestamp& startTime, const Timestamp& endTime);