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
	core/java/com/android/internal/util/cm/QSUtils.java
	packages/SystemUI/res/values/cm_strings.xml
	packages/SystemUI/src/com/android/systemui/quicksettings/CompassTile.java
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsController.java
Notify callbacks on "any" wallpaper change

Callbacks are not notified when the wallpaper is changed to
a live wallpaper.  This patch notifies callbacks of the change
regardless of the type of wallpaper be set.

Change-Id: Icbb7b825cd7e7096c90c5498b6fee0bc61a3de3b
CM11 Themes: Clear wallpaper mixnmatch entry on external change

If a wallpaper is applied from a theme and the wallpaper is changed
from an external source, the theme is still shown to have its
wallpaper applied.  This patch will clear this value out when a
wallpaper change is detected that is not from the ThemeService.

Change-Id: I3d32bb3c0ac96db3f940989bc7ad4eda5e4a71f7

Conflicts:
	services/java/com/android/server/ThemeService.java