Re-implemented app sidebar

Change-Id: I296059a3cc688a567e7e90cccfdf4b8e824cfedf

Conflicts:
	packages/SystemUI/AndroidManifest.xml
	packages/SystemUI/res/layout/halo_trigger.xml
	packages/SystemUI/res/values/custom_dimens.xml
	packages/SystemUI/res/values/pac_styles.xml
	packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java