Graphics/ForwardRenderQueue: Replace listeners by signals

Former-commit-id: 3429e69cc4334ba602d8ccfb1fc725af85d42f7f

include/Nazara/Utility/IndexBuffer.hpp

@@ -67,6 +67,7 @@ class NAZARA_API NzIndexBuffer : public NzRefCounted
 
 		template<typename... Args> static NzIndexBufferRef New(Args&&... args);
 
+		// Signals
 		NazaraSignal(OnIndexBufferRelease, const NzIndexBuffer*); //< me
 
 	private:

include/Nazara/Utility/VertexBuffer.hpp

@@ -65,6 +65,7 @@ class NAZARA_API NzVertexBuffer : public NzRefCounted
 
 		template<typename... Args> static NzVertexBufferRef New(Args&&... args);
 
+		// Signals
 		NazaraSignal(OnVertexBufferRelease, const NzVertexBuffer*); //< me
 
 	private:

include/Nazara/Utility/VertexDeclaration.hpp

@@ -47,6 +47,7 @@ class NAZARA_API NzVertexDeclaration : public NzRefCounted
 		static bool IsTypeSupported(nzComponentType type);
 		template<typename... Args> static NzVertexDeclarationRef New(Args&&... args);
 
+		// Signals
 		NazaraSignal(OnVertexDeclarationRelease, const NzVertexDeclaration*); //< me
 
 	private: