QuickSettings : Wifi-AP Tile

Patchset 2 : Cleanup
Patchset 3 : More cleanup and old comment removal
Patchset 4 : Switch to the WifiManager rather than Power Widget
             Better state handling between WiFi AP and WiFi
             WiFi now turns on again if it was on before
Patchset 5 : Revert Power Widget change from Ps1, no longer needed

Change-Id: I5bd59df37ed3094f5ba253a97fd86aa426b98b39