Complete after: #929

All <parent>->add([<class, ...<seed>>]) methods that accepts seeds other than object variables should be refactored to use the new <class>::addTo(<parent>, <seed>) to enforce refactoring support.

Regex for the most commonly used cases:

= ?.+->add\((?!\$)|->add\((?!\$)[^;]*\)->

In future we may want to accept only objects in the View:add() method and return $this from it.