settings: convenience functions for booleans

Change-Id: I27b66575d5cda575bbc38737697951520327d31a
settings: add torch support

Change-Id: I3a275067aeddd005370c8b4a6f024138eb40804f
Add power dialog options

 * Reboot
 * Airplane toggle
 * Screenshot
 * Torch toggle

Change-Id: Iee337a69a7b8321705adf13088794028c3903b40
quicksettings: add torch tile

Change-Id: I6db6b5fe49ce2637a0f092461b7aafd2142f04c5