Change ID to String (easier for comparisons)
Increment versionCode
Change code array to string array (required for MultiSelectListPreference)
Add prefs strings
Add support category, amend MultiSelectListPreference
Amend preference change listening
1) Add getFilteredResults(), which filters the TfL response based on user's selected lines, if any
2) Amend onUpdateData() to call getFilteredResults()
3) Refactor generateStatusString()