* Add move up, down buttons to list settings
Channel notifications, moderation buttons etc. have a move up and move
down button now for reordering.
* Selection follows moved rows, refactor
Also fixed rows past the 2nd one not moving
* Update selection property with more than 1 column
* Fix crash when moving without a row selected
* Move rows with drag and drop
Right now it's a little iffy registering the row to be moved, but I
wanna go to bed :)
* Remove EditableTableView, move to SignalVectorModel
Replace my ghetto drag and drop solution in EditableTableView with small
patches to the stuff already written in SignalVectorModel::dropMimeData
