Updated CallOnExit

Made it non copyable
Made usage of std::function (thus allowing lambda to be used as
functions)


Former-commit-id: b56cb410bf94bdb3b73d73d7599059d613e41a68

include/Nazara/Core/CallOnExit.hpp

@@ -8,10 +8,12 @@
 #define NAZARA_CALLONEXIT_HPP
 
 #include <Nazara/Prerequesites.hpp>
+#include <Nazara/Core/NonCopyable.hpp>
+#include <functional>
 
-class NzCallOnExit
+class NzCallOnExit : NzNonCopyable
 {
-	using Func = void (*)();
+	using Func = std::function<void()>;
 
 	public:
 		NzCallOnExit(Func func = nullptr);