Re-implemented app sidebar

Change-Id: I296059a3cc688a567e7e90cccfdf4b8e824cfedf

Conflicts:
	packages/SystemUI/res/values/vendor_styles.xml
	packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java