Allow for different line types (dashed, dotted) of separators in ring controls

[Wolfgang]

I made this suggestion some time ago - but had it combined with another idea. Part of the suggestion was implemented so I am trying to revive the remainder here...

For me it would be useful to have at least two different line types for the separator in ring controls, i.e. not only a solid line, but also a dashed (and possibly a dotted) line: This would help to group different entries into groups (solid line) and subgroups (dashed line). The idea would be to provide some more escape codes resulting in the different line styles.

Thanks.