Soloframe fix 2

fix conflicts from: https://github.com/mcallegari/qlcplus/pull/412

Also fix some issues with signals not connected.

Have been tested, and work (both in edit mode and vcliveedit mode):
- copy of simple page soloframe
- copy of multipage soloframe
- adding a widget
- removing a widget
- moving a widget inside the soloframe
- moving a widget outside the soloframe
- going to multipage mode and cloning every widget