App Circle Sidebar: Support for Configurable Trigger Region[1/2]

Change-Id: Ib89a98e607f48108b1a1fb54f00335a3bc4ff2e7

Conflicts:
	core/java/android/provider/Settings.java

Conflicts:
	core/java/android/provider/Settings.java
	packages/SystemUI/src/com/android/systemui/appcirclesidebar/AppCircleSidebar.java