Clean up quick settings tile code.

- Fix up coding style
- Add copyright headers
- Fix some multi-user bugs
- Streamline code

Change-Id: I0a118f7154bdd8cfdacdd7fdf8b76241010179de

Conflicts:
	packages/SystemUI/src/com/android/systemui/quicksettings/AirplaneModeTile.java
	packages/SystemUI/src/com/android/systemui/quicksettings/AutoRotateTile.java
	packages/SystemUI/src/com/android/systemui/quicksettings/BatteryTile.java
	packages/SystemUI/src/com/android/systemui/quicksettings/EqualizerTile.java
	packages/SystemUI/src/com/android/systemui/quicksettings/GPSTile.java
	packages/SystemUI/src/com/android/systemui/quicksettings/HeadsUpTile.java
	packages/SystemUI/src/com/android/systemui/quicksettings/MobileNetworkTile.java
	packages/SystemUI/src/com/android/systemui/quicksettings/SleepScreenTile.java
	packages/SystemUI/src/com/android/systemui/quicksettings/UsbTetherTile.java
	packages/SystemUI/src/com/android/systemui/quicksettings/UserTile.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsController.java