Move SDK include and source to base

include/NazaraSDK/System.inl

@@ -0,0 +1,40 @@
+// Copyright (C) 2017 Jérôme Leclercq
+// This file is part of the "Nazara Development Kit"
+// For conditions of distribution and use, see copyright notice in Prerequisites.hpp
+
+#include <NazaraSDK/Algorithm.hpp>
+#include <type_traits>
+
+namespace Ndk
+{
+	/*!
+	* \ingroup NDK
+	* \class Ndk::System<SystemType>
+	* \brief NDK class that represents a system which interacts on a world
+	*
+	* \remark This class is meant to be derived as CRTP: "System<Subtype>"
+	*/
+
+	/*!
+	* \brief Constructs a System object by default
+	*/
+
+	template<typename SystemType>
+	System<SystemType>::System() :
+	BaseSystem(GetSystemIndex<SystemType>())
+	{
+	}
+
+	template<typename SystemType>
+	System<SystemType>::~System() = default;
+
+	/*!
+	* \brief Registers the system by assigning it an index
+	*/
+
+	template<typename SystemType>
+	SystemIndex System<SystemType>::RegisterSystem()
+	{
+		return GetNextIndex();
+	}
+}