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

Tile drawables credit to Bjorn Lunden

Patchset 1-4 : Initial commits
Patchset 5   : Fix state not showing properly
               Remove old comment
Patchset 6   : Fix comments per Jesús David

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

Change-Id: I15371989bb2ce977d1b715e52d9c92c27ea108ca