Code cleanup

- Revised Cursor-related methods to make sure I closed as many as
possible after we were done utilizing them.
- Removed "Play All" option from OptionsMenu. ForceClose was kind of
difficult to handle.
- Removed plenty of unnecessary log events.
- Fixed: While on the PlayerHolder, selecting a song from playlistviewer
or queueviewer would re-instantiate the activity, now it only updates
current info displayed.
- Finally decided to use Andrew Neal's refreshNow() implementation for
progressbar.
- Groundwork for onPreferenceChange listener.
- Cleaned up look of sliding menus, need more work.
- Other stuff I can't remember