Work on prediction thing

Not done
More prediction work.

Predictions come into the list, but don't replace old ones.
Added requisite files
Prediction UI mostly works!

Displays arrivals at stopid, filtered by route if available, with nice
update timing. No actions in yet, though.
Tapping prediction starts arrival service for it

Doesn't improve the notify service, so it doesn't specify between
directions at the same stopid.