Filter preferred lines for a single stop

[kiliankoe]

It could be possible that a user is only interested in a specific line for a stop. Maybe only line 11 for the stop Postplatz, where there's usually a lot of other noise as well. Being able to filter would be a nice addition.

This would however make it quite a bit more interesting how the number of displayed stops is handled. It would probably be better to get as many connections as possible anyways and do the rest in the app.