No Need Restart for Clock and BatteryBar

1) BatteryBarView receiver to change color/animation without restarting
SystemUI
2) SecondsClock receiver to change bold/format/enable without
restarting SystemUI
3) Cleaned unnecessary imports in SettingsActivity
4) Send settings change broadcast everytime settings is changed in
SettingsActivity
5) Remove reminder to restart SystemUI

Thanks (a lot!) to the Broadcast Receiver/Sender implementation by
Dzakus from the previous commit