Added parameters to Clock class

It is now possible to build a Clock object in a paused state, or to give
it an "already elapsed time" value


Former-commit-id: 20e9c55de8a12a9220f81dc7759a4113a794648f

include/Nazara/Core/Clock.hpp

@@ -18,7 +18,7 @@
 class NAZARA_API NzClock
 {
 	public:
-		NzClock();
+		NzClock(nzUInt64 startingValue = 0, bool paused = false);
 
 		float GetSeconds() const;
 		nzUInt64 GetMicroseconds() const;