relation editor: Show continuity line with nodes in between ways for some types of relation

[skyper]

Follow up of #18503.

skyper (comment 4):

I still think we need some improvements of the continuity line.

E.g.:

• route relation with members of type node in between the way (stops, guideposts, ...)
• superroute #18503
• turn-restriction with via node in between ways

route relation

Like ptv1 (role=stop) and hiking (role=guidepost) nodes with certain roles are allowed in between ways. Could JOSM have the continuity line jump over these unconnected nodes and do not count them as gap, please.

turn-restriction

Show that the via node is connected between the ways with order from way (1), via node (2), to way (3) or revers. Do not count this situation as gap.

Thanks

[skyper]

See #16478 for a similar request for pt relations.