add Voice Wakeup switch

 * Requires CYNGN package to do the actual work.

Change-Id: I1c129adf1104dd95d3afb76224af4c9ba2b5db96
(cherry picked from commit 83cc29347ba93d53c00a441d857fdd588c37c035)

Conflicts:
	proguard.flags
	res/values/cm_strings.xml
	src/com/android/settings/cyanogenmod/ShortcutPickHelper.java