Settings: Forward port Kill app longpress back

Based on http://review.cyanogenmod.org/#/c/27235
Original author: DaneshM

Change-Id: I6e8bfb4e7e4a35c321a01debf8fdb3a38120267b
SoundSettings: Hide Ascending ringtone preference if device doesn't have voice capability

Change-Id: I24fb7a1dd509af6e848a155043f561fc225b5f17
Settings: add back SMS security limit

Limit the number of outgoing messages per every 15 minutes by
any application that sends text messages.

PS2-4: Whitespace fixes

Change-Id: Ibb61396ea9adb3f95cdbd13b91cbbc3477f6e361