Zen mode voice activity now only sets the notification mode to alarms mode
or off. A duration may be specified if it was in the original intent.
Change-Id: Ica472ca9c6dcbce473832f4f922baf225df4951b
Bug: 21024455
Small cleanup of the UI / strings.
- Cleanup of string constant names.
- Add a specific string for ZenModeVoiceActivity label.
- Change look of list position indicators.
- Add optional header to VoiceSettingsActivity.
- Fix NPE in some cases when disabling Zen mode.
Change-Id: Ic09ee2b1b5a50891b5447c2db0e3de3c475696bf
