settings: Add option to toggle the pointer icon when using stylus

Forward-port to CM-11.0

Change-Id: Ib9c22ecb05cc698ead5bfffa34d2a2ffa9c21e13

Conflicts:
	res/values/cm_strings.xml
	res/xml/language_settings.xml
	src/com/android/settings/inputmethod/InputMethodAndLanguageSettings.java
derp