Renderer: Replace ShaderStage by ShaderModule (a module can handle multiple stages)

src/Nazara/Renderer/ShaderModule.cpp

@@ -0,0 +1,11 @@
+// Copyright (C) 2020 Jérôme Leclercq
+// This file is part of the "Nazara Engine - Renderer module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#include <Nazara/Renderer/ShaderModule.hpp>
+#include <Nazara/Renderer/Debug.hpp>
+
+namespace Nz
+{
+	ShaderModule::~ShaderModule() = default;
+}