LABEL_SELFREF route name

[yakra]

DataProcessing/siteupdate/cplusplus/classes/Waypoint/Waypoint.cpp

Line 492 in 387c99b

std::string rte = route->banner[0] == '-' ? route->route : route->name_no_abbrev();

No need to keep constructing this for every Waypoint. It's the same for the whole Route.
Construct during route_integrity & pass to label_selfref by reference.

Do this at the same time as #280.