Framework: Pulse Torch On Incoming Call (4/4)

Move our SliderPreference to framework for
	global usage

Add some torch constants

Add Settings entries

Change-Id: I3bf8e3d140ef507e2a72e3abbdad6ec1603dfbc3

Conflicts:
	core/java/android/provider/Settings.java
	core/java/com/android/internal/util/slim/TorchConstants.java
	core/res/res/values/slim_strings.xml