Move SDK include and source to base

include/NazaraSDK/Systems/VelocitySystem.hpp

@@ -0,0 +1,29 @@
+// 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
+
+#pragma once
+
+#ifndef NDK_SYSTEMS_VELOCITYSYSTEM_HPP
+#define NDK_SYSTEMS_VELOCITYSYSTEM_HPP
+
+#include <NazaraSDK/System.hpp>
+
+namespace Ndk
+{
+	class NDK_API VelocitySystem : public System<VelocitySystem>
+	{
+		public:
+			VelocitySystem();
+			~VelocitySystem() = default;
+
+			static SystemIndex systemIndex;
+
+		private:
+			void OnUpdate(float elapsedTime) override;
+	};
+}
+
+#include <NazaraSDK/Systems/VelocitySystem.inl>
+
+#endif // NDK_SYSTEMS_VELOCITYSYSTEM_HPP