Design-time propagation of bound data

[patrik-u]

Provide a way to turn off design-time propagation of bound data. It's nice to see bound data show up and be propagated in the editor, we can also generate dynamic list items in the editor and save initialization time. However, it may also lead to a lot of data being created (e.g. generated list items), during design time that we don't necessarily want. We can have a check-box on the view-presenter that turns off this behavior and perhaps a field on List view that disables design-time generation of list-items.