Floating window (1/2)
This is the popup code from Paranoid Android's HALO, which has already been commited. This commit just allows it to be on or off as some users may not want to use this function. We have a better idea on how to use this functionaility which will be seen later.

For now though, this is the messy way of turning it on and off.

Change-Id: I4971a6c09db38717a7236219f2cd5b28c48e0c52
Author: benjamingoodwin (BeerGang)