Add system graph (wip)

include/Nazara/Graphics/Systems/RenderSystem.inl

@@ -3,10 +3,23 @@
 // For conditions of distribution and use, see copyright notice in Config.hpp
 
 #include <Nazara/Graphics/Systems/RenderSystem.hpp>
+#include <type_traits>
 #include <Nazara/Graphics/Debug.hpp>
 
 namespace Nz
 {
+	template<typename T, typename ...Args>
+	T& RenderSystem::CreateWindow(Args&& ...args)
+	{
+		static_assert(std::is_base_of_v<RenderWindow, T>, "T must inherit RenderWindow");
+
+		auto windowPtr = std::make_unique<T>(std::forward<Args>(args)...);
+		T& windowRef = *windowPtr;
+
+		m_renderWindows.emplace_back(std::move(windowPtr));
+
+		return windowRef;
+	}
 }
 
 #include <Nazara/Graphics/DebugOff.hpp>