Convert all remaining enums to enum classes (!)

include/Nazara/Core/MemoryStream.inl

@@ -13,7 +13,7 @@ namespace Nz
 	* \brief Constructs a MemoryStream object by default
 	*/
 	inline MemoryStream::MemoryStream() :
-	Stream(StreamOption_None, OpenMode_ReadWrite),
+	Stream(StreamOption::None, OpenMode_ReadWrite),
 	m_pos(0)
 	{
 	}