add search header in habit list
keep search query on orientation changes.
keep selected items selected when cancelling search/searching
Merge branch 'feature/new-habit-search' into feature/new-habit-view
support updating habits in the ItemAdapter.
update list when adding habits. Create setter for habit in detailfragment to simplify reloading.
Merge branch 'feature/new-habit-view-edit-habit-update' into feature/new-habit-view
fix updating of ItemAdapter to filter items again.
make singlepane work. item list updates the list with the passed
add margin to itemDetailActivity. Fix crash when navigating back after turning the screen
Merge branch 'feature/new-habit-view-single-pane' into feature/new-habit-view
readd export/import functionality.
Readd delete habit function. better callback.
add/remove TODOs
let ItemAdapter load the habits asynchronously
reload list after import.
add refresh button.
remove unused  edit-classes and stuff.
remove "settings" menu and unused strings and more unused fragments.
Merge branch 'feature/remove-habit-classes' into feature/new-habit-view