Merge internal branch.

- Remove old/unused code.
- Remove format string constructors.
- Better win64 support (vsscanf, prefetch, etc).
- Fix radix sort to sort -0 correctly.
- Add misc utilities (constraints, timer, cpuinfo, introsort).

src/nvcore/Timer.h

@@ -0,0 +1,22 @@
+// This code is in the public domain -- castano@gmail.com
+
+#ifndef NV_CORE_TIMER_H
+#define NV_CORE_TIMER_H
+
+#include <nvcore/nvcore.h>
+
+#include <time.h> //clock
+
+class NVCORE_CLASS Timer
+{
+public:
+	Timer() {}
+	
+	void start() { m_start = clock(); }
+	int elapsed() const { return (1000 * (clock() - m_start)) / CLOCKS_PER_SEC; }
+	
+private:
+	clock_t m_start;
+};
+
+#endif // NV_CORE_TIMER_H