m7-common: Add controls to long-press and double-tap of the home button to match HTC One GE edition

* Patchset 1: Initial Commit
* Patchset 2: Whitespace murdering
* Patchset 3: Correct value for double-tap Home from Menu to Assist Intent (Google Now)

Change-Id: I41e314d473176d57bc09805185780ca3aff94c06