Frameworks: Adds ability to answer call with hardware HOME button (1/2)

Port of CM commit: 8c5ef198bd4031d11691daef34d9f5f2b1354da3
Full Credit to CM team

Change-Id: I5997ef290173d63de4996e0be861c3efa164ccfe

Conflicts:
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
Framework: Add Home/Back buttons available for rebinding (1/2)

Finally, we can disable or rebind all hardware buttons!
Also adds Expanded desktop toggle and Notification shade toggle

Change-Id: I0ca51c25e8434696a514fd1ef1e1e33543bf066a

Conflicts:
	core/java/android/provider/Settings.java
	core/res/res/values/symbols.xml
Frameworks: Advanced low battery indicator options (1/2)

Based on a idea I saw on Liquid and from CR3C0 (thanks guys) which we
modified to an extended version

This commit introduces following new SlimBean modes to indicate low battery

     * 0 = show dialog + play sound (default)
     * 1 = fire notification + play sound
     * 2 = show dialog only
     * 3 = fire notification only
     * 4 = play sound only
     * 5 = none

Due that notification is a unique SlimBean feature some words on it. Notification
behaviour is the same as Pop-up. User can dismiss it manually or it is
dismissed automatically if charger is connected, click on notification opens
PowerUsageSummary. Also you get a status bar ticker message about the notification
and notification is always on first place of list. And last if vibration is enabled
notification vibrates.

Patchsets:
 - codestyle corrections

Patchst
 - add PowerUsageSummary intent

cheers

Change-Id: I84476626b0ff5424454a1132ea4ef77a696070c1