Carbon Settings Mega Ka... Revamp!

- New CarbonRom settings which now holds Interface, Lockscreen, Navigation, etc
- Moved Xposed settings out of Interface settings
- Refactored main Settings menu. It now lists CarbonRom, Performance, Themes
  and Xposed headers under Carbon Links
- Moved About Carbon to new CarbonRom settings
- Moved Pie Controls to CarbonRom submenu (credit PA for the icon)
- Moved Pie related java files to com.android.settings.carbon
- Moar clean up and reorder everywhere else