Settings: Heads Up background color && transparency [1/2]

Change-Id: I606bf35d5db9a253448971bdedf6fdb3acad6452

Conflicts:
	res/values/slim_strings.xml
	src/com/android/settings/slim/HeadsUp.java
Heads up exclude LS new location: fix

now the setting should update itself correctly after the tap

Change-Id: I310c73c8ce936976a29f9903a9f7114030938a29

Conflicts:
	src/com/android/settings/slim/HeadsUp.java