framework: Add compass tile (1/2)

Add a compass tile to quick settings.
Clicking on it enables the sensor and clicking again disables it.

Screenshot: http://goo.gl/2frdpy

Change-Id: Icd9d12929f0491f6958f30de139ef39bb4c2e037

Conflicts:
	core/java/com/android/internal/util/cm/QSConstants.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsController.java

Patchset: 12
http://review.cyanogenmod.org/#/c/64243/
(cherry picked from commit 3cdeca6043a7801fd8c532f7d88974d9a253bb0f)
Revert "Reduce memory leaks by removing all views."

This reverts commit bbebee4faaf886279cadefb5dfd051630f4a306f.

(cherry picked from commit 52f952bab597aeae805868bffe30d8496e62ad93)