Improved code

Fixed Directory being copyable
Fixed ByteArray and String self-assignation
Made it clear Clock is copyable


Former-commit-id: 36702d8a389abe6d3faa1e283d9a20f0326041a6

include/Nazara/Core/Clock.hpp

@@ -19,6 +19,7 @@ class NAZARA_API NzClock
 {
 	public:
 		NzClock(nzUInt64 startingValue = 0, bool paused = false);
+		NzClock(const NzClock& clock) = default;
 
 		float GetSeconds() const;
 		nzUInt64 GetMicroseconds() const;
@@ -30,6 +31,8 @@ class NAZARA_API NzClock
 		void Restart();
 		void Unpause();
 
+		NzClock& operator=(const NzClock& clock) = default;
+
 	private:
 		NazaraMutexAttrib(m_mutex, mutable)