Settings: added missing persistent=false

settings that are stored in Settings dont need to
be made persistent again in the settings storage
and should use android:persistent="false"

This will also make it possible to change
the type of a settings without interference
with the settings storage breaking upgrades

Change-Id: I03fd51f463f38b10969fac9c3db533710187611e

Conflicts:
	res/xml/development_prefs.xml
	res/xml/display_settings.xml
	res/xml/power_usage_summary.xml
	res/xml/security_settings_password.xml
	res/xml/security_settings_pin.xml
	res/xml/sound_settings.xml
put halo in with the interface settings

also add the smokestack icon for bars
Change-Id: Ibba8620a15caf0806994e8ebd032deaa1ef1b16b