modernize C++: avoid bind

In many cases std::bind() is kept because the code is much simpler

src/Mod/Part/Gui/ViewProviderAttachExtension.cpp

@@ -118,7 +118,9 @@ void ViewProviderAttachExtension::extensionSetupContextMenu(QMenu* menu, QObject
         QAction* act = menu->addAction(QObject::tr("Attachment editor"));
         if (Gui::Control().activeDialog())
             act->setDisabled(true);
-        func->trigger(act, std::bind(&ViewProviderAttachExtension::showAttachmentEditor, this));
+        func->trigger(act, [this](){
+            this->showAttachmentEditor();
+        });
     }
 }