QuickSettings: Add LTE Tile (1 of 2)

Patchset 3 - Add proper drawables and update logic
Patchset 4 - Rebase
Patchset 5 - Fix build errors

Thank you to Bjorn Lunden for the drawables

Change-Id: Ia25d098020586e06d38589f84d3d1a581e7cbd9a

Conflicts:

	packages/SystemUI/res/values/strings.xml
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsController.java

Fixes for LTE Toggle

Additional fixes for LTE toggle...
SystemUI: Fix potential NPE

Does already cause issues on some Halo ports to other ROMs.
Might not cause issues on PA (yet), but better safe than sorry.
clean up double imports
Merge branch 'jb43' into jb43-galaxynexus