Settings: Safe headset volume override legal waiver

Patch set 1  : Initial commit
Patch set 2  : Remove alert icon (per Design guidelines)
Patch set 3  : Fix per Danesh's comment

Change-Id: Ic6b9ba2620de6efb327416e8955c3a2c08af043b
QuietHours Tile (2/2)

Allows user to toggle state of quiet hours

Change-Id: I9d3234b993d250a7d43683b51c1c3254aaec262f
Update the SMS sending limit instantly (2/2)

This commit also shortens and simplifies the preference summary text
considerably.

Patch set 2  : Slight rewording
Patch set 3  : Another minor wording change

Change-Id: Ic7ed803e22ead8c41346a66edc6db65cee93c39a