Added NzInputStream

Added NzFile::Read(buffer, size)
NzFile::Read(nullptr, size) now acts as a skip function (ex: SetCursorPos(GetCursorPos() + size)

src/Nazara/Core/InputStream.cpp

@@ -0,0 +1,8 @@
+// Copyright (C) 2012 Jérôme Leclercq
+// This file is part of the "Nazara Engine".
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#include <Nazara/Core/InputStream.hpp>
+#include <Nazara/Core/Debug.hpp>
+
+NzInputStream::~NzInputStream() = default;