stub of CityInstance, which we'll use later to store information about which cities we can plan routes within
Stub open settings button
stubby preferences
citygetter actually gets cities
toward getting and saving instance state
save instances json
refactoring
refactoring the citypicker preference thingie
continuing refactoring of citypicker
populate citypicker from persisted city list
actually persist selected city between app instances
some ui tweaks for city-picking