Add another pitch detection algorithm (from Performous) and wrapped everything in c++/cli classes

PitchTracker/compatibility.cpp

@@ -0,0 +1,30 @@
+#include "compatibility.h"
+
+#include <math.h> 
+
+#ifdef _MSC_VER
+#if(_MSC_VER < 1800) // < VS2013
+namespace std
+{
+	float round(float d)
+	{
+		return static_cast<float>(floor(d + 0.5));
+	}
+
+	double round(double d)
+	{
+		return floor(d + 0.5);
+	}
+
+	long double round(long double d)
+	{
+		return floor(d + 0.5);
+	}
+
+}
+
+double remainder(double num, double denom){
+	return num - std::round(num/denom) * denom;
+}
+#endif
+#endif