Unique identifier (ID) of the item to which you want to attach the connector. Note that Frames are not supported at the moment.
The side of the item connector should be attached to, the connection point will be placed in the middle of that side. Option
auto allows to pick a connection point automatically. Only either
snapTo parameter is allowed to be set, if neither provided
snapTo: auto will be used by default.
The start point of the connector. startItem.id must be different from endItem.id