Add option to disable volume key beep sounds (1/2)

Change-Id: Ibaada8b5a0fece80fc8182c44b22a44a433f07a5

Conflicts:
	res/values-de/strings.xml
	res/values-es/strings.xml
	res/values-ja/strings.xml
	res/values/strings.xml
	res/xml/sound_settings.xml
	src/com/cyanogenmod/cmparts/activities/SoundActivity.java