SystemUI: Add double tap to sleep

* Make it more reliable
* Add it to keyguard
* Add a content observer to not always query Settings.System on every
touch event

Change-Id: I292c4d9d9f810843590b7a9ec6e15b99ac44009d
Signed-off-by: Roman Birg <roman@cyngn.com>

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
SystemUI: Revert all caf statusbar icon additions

This is still a not to the endd thought nightmare + that we do not really need it right now.

Roll back for now till it is completely overworked.

Change-Id: I7ce9226535680303ff99139cfd3083d52608b88a
SystemUI: add quick settings pull down with one finger

Logic is currently set to use 1/3 of right hand side of the statusbar to
trigger a quick settings quick pull down, quickly.

Change-Id: I3f536496f724f07d2419a5b2db5fa8f8261609e7
Signed-off-by: Roman Birg <roman@cyngn.com>