Renderer/Renderer: Replace listeners by signals

Former-commit-id: c1293f7f7cc31c4122ba866fc44d93188917ad93

include/Nazara/Utility/VertexDeclaration.hpp

@@ -12,6 +12,7 @@
 #include <Nazara/Core/ObjectListenerWrapper.hpp>
 #include <Nazara/Core/ObjectRef.hpp>
 #include <Nazara/Core/RefCounted.hpp>
+#include <Nazara/Core/Signal.hpp>
 #include <Nazara/Utility/Enums.hpp>
 
 class NzVertexDeclaration;
@@ -46,6 +47,8 @@ class NAZARA_API NzVertexDeclaration : public NzRefCounted
 		static bool IsTypeSupported(nzComponentType type);
 		template<typename... Args> static NzVertexDeclarationRef New(Args&&... args);
 
+		NazaraSignal(OnVertexDeclarationRelease, const NzVertexDeclaration*); //< me
+
 	private:
 		static bool Initialize();
 		static void Uninitialize();