Add option for line jumps to whiteboards

Many shapes I use within whiteboards have connector lines. Many of those diagrams have lines that cross-over. It would be helpful to have line jumps so that there isn't confusion about where the lines are intended to go.

For example, process diagrams, dependency mapping, workflow diagrams etc. The Aha! record map template I'm using at the moment has connector lines which cross when depicting within-product record alignment and cross-product record alignment.