Quick Settings: Add Network mode tile (part 1 of 2)

Tile drawables credit to Bjorn Lunden

The tile requires http://review.cyanogenmod.org/#/c/28699/ to function

This commit also inlcudes a bit of code cleanup and sets the
default tiles to AOSP defaults

Change-Id: I15371989bb2ce977d1b715e52d9c92c27ea108ca

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