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

Change-Id: Ib9c22ecb05cc698ead5bfffa34d2a2ffa9c21e13

Conflicts:
	res/values/strings.xml
	src/com/android/settings/inputmethod/InputMethodAndLanguageSettings.java

Conflicts:
	src/com/android/settings/inputmethod/InputMethodAndLanguageSettings.java