Add button to relation editor to remove all ways for which problems are reported in validator

[Polyglot]

With the new routing helper functionality, it has become easier to fix routes.

The helper is better at adding ways than at removing the 'offending' ones though.

So some 'preprocessing' is required. One thing that would help is to remove all the ways where the bus would go against oneway restrictions.

This information is available in the validator. Removing it from there, is not as practical as it could be though. it needs to be done, one by one, relation per relation.

[skyper]

In my cases, most of the time, it is a problem of the members' order or the wrong part of a dual-carriage way or roundabout is used. Think it would help much more if the offending ways would be selected along with the relation in the validator dialog.