Voice Shutter: Voice triggered snapshots

If one of the pre-specified hotwords is detected, fire the shutter
and take a picture

Change-Id: I8fc716c836728f82fd69741a6c1c7864d86934c4

Conflicts:

	res/values/cm_arrays.xml
	res/values/cm_strings.xml
	res/xml/camera_preferences.xml
	src/com/android/camera/CameraSettings.java