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

This is the settings part of the pie commit, for the real implementation
look in frameworks/base.

Patch Set 3:
* CyanogenMod Code Style

Patch Set 4:
* Strings cleanup
* Better integration into CyanogenMod system settings UX
* Some related cleanup in SysteSettings.java

Change-Id: I47599316273d8e46017f49ba62a02cc55a785678