Settings: Add toggles for several CM additions

Under 'Display':
 - Proximity check on wake
 - High touch sensitivity

Under 'Languages and input':
 - Touchscreen hovering
 - IME selector notification
 - Hardware keyboard options that AOSP removed

Under 'Security':
 - Lock screen blur

Under 'Developer options':
 - Long press to kill app

Change-Id: Ie83622a5e61a24dfa7adb75ed26c7558cec7b23b