Stylus gestures features (2/2)

Change-Id: If4fa001a124874b3264ea1980e846e1ab9de50e8

Conflicts:
	res/values/arrays.xml
	res/values/strings.xml
	src/com/android/settings/inputmethod/InputMethodAndLanguageSettings.java
inputmethod: Fixup remove stylus preference for non stylus devices

This commit included following changes

 * Move show stylus icon checkbox to Pointer Settings Category
 * Fixup issues stylus preference doesn't remove if not supported
 * Improve the code remove stylus preference if not supported
 * Remove an unnecessary variable introduced on http://review.cyanogenmod.org/#/c/33774/

Change-Id: I0f2e1b5cda00033915bb25902ce970f9eda52048

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