* M12: create the next board shape already connected (#1597)
A selected sticky or shape shows a + beside each side; hovering one previews where the next goes, clicking makes one of the same kind, size and colour there, joined by a connector, and starts typing in it, in one undo step. board.addConnected {id?, side?, edit?} does it from commands.
* M12: the connected-shape handle and command in every full catalog (#1597)
* M12: Shift+Cmd/Ctrl+Enter on a board shape adds the next one already connected (#1597)