[1/2] Base: more addition for tinted system bar

add option to allow tinted color change window shade panel
improve tinted color logic code

Change-Id: I9e4ca93d9dec29c5351e09fce64bf6bf124aa1cc

Conflicts:
	core/java/android/provider/Settings.java
	packages/SystemUI/res/values/colors_custom.xml
	packages/SystemUI/res/values/styles.xml
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java