qmlcompiler: Implement ability to deal with reparenting

We need to add the ability for qmlcompiler to handle dynamic reparenting. This can probably be done by adding the necessary information to qmltypes.

Example where not handling dynamic reparenting (but instead using the document parent) leads to us not issuing a warning, even though we should:

import QtQuick 2.15

ListView {
  id: lv
  model: 1
  delegate: Text {
    text: parent.keyNavigationEnabled // this does not work
    // text: lv.keyNavigationEnabled // <-- this works
  }
}

The reverse case can be handled via an as cast (if the contentItem has a named type), but that's still unfortunate:

ListView {
    contentItem: Rectangle {
        color: "red"
    }
    delegate: Text {
        color: NotQt.complimentaryColor((parent as Rectangle).color) // this as cast shouldn't be needed
    }
}