[11902] Import Recast Navigation

Import Recast Navigation as third party dependency
Credits go to Mikko Mononen memon at inside dot org

dep/recastnavigation/RecastDemo/Source/PerfTimer.cpp

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+//
+// Copyright (c) 2009-2010 Mikko Mononen memon@inside.org
+//
+// This software is provided 'as-is', without any express or implied
+// warranty.  In no event will the authors be held liable for any damages
+// arising from the use of this software.
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+// 1. The origin of this software must not be misrepresented; you must not
+//    claim that you wrote the original software. If you use this software
+//    in a product, an acknowledgment in the product documentation would be
+//    appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//    misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+//
+
+#include "PerfTimer.h"
+
+#if defined(WIN32)
+
+// Win32
+#include <windows.h>
+
+TimeVal getPerfTime()
+{
+	__int64 count;
+	QueryPerformanceCounter((LARGE_INTEGER*)&count);
+	return count;
+}
+
+int getPerfDeltaTimeUsec(const TimeVal start, const TimeVal end)
+{
+	static __int64 freq = 0;
+	if (freq == 0)
+		QueryPerformanceFrequency((LARGE_INTEGER*)&freq);
+	__int64 elapsed = end - start;
+	return (int)(elapsed*1000000 / freq);
+}
+
+#else
+
+// Linux, BSD, OSX
+
+#include <sys/time.h>
+
+TimeVal getPerfTime()
+{
+	timeval now;
+	gettimeofday(&now, 0);
+	return (TimeVal)now.tv_sec*1000000L + (TimeVal)now.tv_usec;
+}
+
+int getPerfDeltaTimeUsec(const TimeVal start, const TimeVal end)
+{
+	return (int)(end - start);
+}
+
+#endif