~ Initial SDL2 implementation

Limitation
- Dependent projects need to set NAZARA_PLATFORM_SDL2 if nazara has been build with SDL2 since OpenGL.hpp (and maybe some other headers) exposes platform details
- SDL2 window doesn't supports async window since the API isn't fitting for now
- Contexts parameters can't be changed until we close all the SDL windows (SDL limitation)

src/Nazara/Platform/SDL2/IconImpl.hpp

@@ -0,0 +1,33 @@
+// Copyright (C) 2017 Jérôme Leclercq
+// This file is part of the "Nazara Engine - Platform module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#pragma once
+
+#ifndef NAZARA_ICONIMPL_HPP
+#define NAZARA_ICONIMPL_HPP
+
+#include <Nazara/Prerequisites.hpp>
+#include <Nazara/Utility/Image.hpp>
+#include <SDL2/SDL_surface.h>
+
+namespace Nz
+{
+	class Image;
+
+	class IconImpl
+	{
+		public:
+			bool Create(const Image& image);
+			void Destroy();
+
+			SDL_Surface* GetIcon();
+
+		private:
+
+			SDL_Surface* m_icon = nullptr;
+			Image m_iconImage;
+	};
+}
+
+#endif // NAZARA_ICONIMPL_HPP