Bringing basic pie controls to CyanogenMod. (1/2)

Based on the multiple navigation key bar patch, this commit adds
basic pie controls to CyanogenMod. The implementation is inspired
by Paranoid Android but is completely rewritten.
The aim was to get as little intersection with existing code as
possible and provide a farily easy interface to extent these
controls by new slices (inherited from PieSlice).

The pie controls are only active when expanded screen is turned on.

Based on this commit there is another one that adds more optimizations
for Phone UI to pie controls. And there is a seperate commit for
the settings app, too.

Patch Set 2:
* Cyanogen Code Style.
* Some simplifications in PieSysInfo.java

Patch Set 3:
* Fixed NPE when pie controls are completely deactivated
* Preserve state of menu button

Patch Set 4:
* Fix display of Wifi SSID
* Some cleanup and coding style changes

Patch Set 5:
* Fix NPE when not connected to Wifi
* Remove AM/PM from time display (overlayed the other info)
* Fix menu button handling

Patch Set 6:
* Remove trailing whitespace in 12 hour time format

Patch Set 7:
* Tune colors
* Improve battery level and operator printout
* Remove some unused imports

Patch Set 8:
* Some refactoring on pie trigger management
* Copyright fix
* Make debug on PieLayout less noisy

Patch Set 9:
* Fix NPE one devices with no GSM/CDMA/LTE
* New color proposal
* Haptic feedback now respects system setting

Patch Set 10:
* Factor out haptic feedback into separate method

Patch Set 11:
* Prepare for "always on"
* David's color scheme

Change-Id: I90de7252d8301282d396c29bc9e9943acf7f2766