Bimba.git

- official timetable from ZTM
- VM can be used without offline timetable
- offline timetable uses exact dates (instead of workdays/saturdays/holidays)
- VM is quicker and is more reliable (as it’s computed in the same way as offline departures)
- favourites rewritten from scratch
- app is movable to external storage
- new colours—grey and green—fitting new Poznań style
- multiple bug fixes