filter_list.xml:
- Remove the split filter/song list and replace with a single filter list
FiltersListFragment:
- setActivateOnItemClick within onViewCreated
ItemListFragment:
- uncomment the ARG_ID
- setActivateOnItemClick() in onViewCreated
- handle arguments being passed and setListAdapter to a cursor that is created
MainActivity:
- rename mTwoPane to _multiPane
- in onCreate() if in "single pane" mode create the FiltersListFragment and add it to the container
- modify onSongSelected to handle single-pane mode
- add a null check in refreshFilter()
- modify onFilterSelected() to handle single-pane mode by creating and adding ItemListFragment

Change-Id: I4eac9a56da07fe294064b2301889ab77d3f860c3