Make swimlanes systems-agnostic

Currently, swimlanes are auto-created every time a new combination of role/responsibility or system is entered into the "assign role" section of an activity.

This creates multiple swimlanes if the same role uses different systems within a process, resulting in a messy process map.

Having system tags in an activity is a useful function, though.

It would be excellent to be able to "switch off" the inclusion of systems as determinants of additional swimlanes.