SystemUI: Clock - right/center/off (Part 1 of 2)

Allow for clock to be placed to the right/centered/off

Ported from AOKP clock mod by Adam Fisch
http://gerrit.sudoservers.com/#/c/1963/

Change-Id: Ia06708f4ba7629d76d6625b87b22cca999d01e1b
Signed-off-by: Desterly <d3s7royer@gmail.com>

Conflicts:
	packages/SystemUI/res/layout/status_bar.xml
	packages/SystemUI/res/layout/status_bar_expanded_header.xml
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
	packages/SystemUI/src/com/android/systemui/statusbar/policy/Clock.java