Way to add new WizardPage from virtual component

There is need to add a new WizardPage from a virtual component. This means that it's never directly selected by user and it cannot react to selection change until user has pressed Next and IFW calculates the full dependency list.

Currently problem is that adding new WizardPage at that time has no affect, since the next page is already shown, and when running MaintenanceTool/Add components, it's already the last page.

This was originally tried to be solved with QTIFW-503, but that lead to other problems QTIFW-551