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

Change-Id: Ib9c22ecb05cc698ead5bfffa34d2a2ffa9c21e13
Signed-off-by: ayysir <dresadd09691@gmail.com>

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