Use the new PreferenceDrawerActivity to make use of the navigation drawer UI.

Patch Set 1:
  Only the main Settings activity and referneces to it should be using
  the PreferenceDrawerActivity, all others should continue to use the
  standard PreferenceActivity.

Change-Id: Iced8cb2b4da6bc059426517ab052911d37814b59
Revert "Hardware Keys: Backlight Timeout (2/2)"

This reverts commit 8784220a3633cbee384c3edfd578a5a0233c1fb3.

Conflicts:
	res/values/arrays.xml
	res/values/strings.xml

Change-Id: I0952cc87b9147c947481964fa9d52a4ac441f823