add Settings.System boolean helper methods

Change-Id: I749d15a7c6956d938698f16ebde185b114f7f15a
Signed-off-by: Roman Birg <romanbirg@gmail.com>
Port forward: Alternate Default App Picker / Reboot Dialog

Alternate Default App Picker
--Zaphod <mwilson@acesappraisal.com>

Reboot Dialog and subsequent fixes
--Roman <romanbirg@gmail.com>

Port to work on 4.2, apparently Google thinks it's funny to
move the ShutdownThread every rev...

Change-Id: I4ab31e6767079c3bb6a9cba0a15b36e3627e9aef
Port forward: Clock styles, carrier text, notif count

SystemUI: Clock mode. Center, Right, Hidden. AM/PM and Weekday
options.
-- syaoran12 (aka adamthecashew)

SystemUI: Notification counter
-- Stevespear426

SystemUI: Clock fix for 24 hour format
-- KhasMek

Custom Carrier Label
-- netboy3

Change-Id: Ie24eeb33b4b546586019c5f468e1a489c15bba5f
Port forward: Battery types, Cog circle battery updates

SystemUI: Cog Circle Mod Battery
--kwes1020

SystemUI: Battery Styles
--syaoran12 (aka adamthecashew)

Change-Id: I25c4c27be70048b5c44e7c645c25487cbf602aaf