User-selectable camera click sound [1/3]: (stock(bloop)/realistic/disabled)

ps21: change listview key so the internal preference persistence doesn't try to turn a string into a boolean behind the scenes.
ps22: it might help if we make SoundSettings handle preferenceChanged events, mmmmkkkkkaaaayyyyyy?

Originally: option to disable camera sounds (1/3) by sethyx

Change-Id: Ibc61515e78ecfa1d438b3770b02284c4cb9d7f23
Signed-off-by: nuclearmistake <nuclearmistake@gmail.com>