BAN: implement basic swap

This will be improved, currently just works on general type T and
moves values between arguments.

BAN/include/BAN/Swap.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <BAN/Move.h>
+
+namespace BAN
+{
+
+	template<typename T>
+	void swap(T& lhs, T& rhs)
+	{
+		T tmp = move(lhs);
+		lhs = move(rhs);
+		rhs = move(tmp);
+	}
+
+}