Fully replace listener system by signals

Former-commit-id: 032dfddd12cc3a792c71426148c758ffac3621f9

src/Nazara/Utility/StaticMesh.cpp

@@ -18,6 +18,8 @@ NzSubMesh(parent)
 
 NzStaticMesh::~NzStaticMesh()
 {
+	OnStaticMeshRelease(this);
+
 	Destroy();
 }
 
@@ -57,7 +59,7 @@ void NzStaticMesh::Destroy()
 {
 	if (m_vertexBuffer)
 	{
-		NotifyDestroy();
+		OnStaticMeshDestroy(this);
 
 		m_indexBuffer.Reset();
 		m_vertexBuffer.Reset();