Add Pie Controls style", (2/2):

Some code is ported from SlimRoms.

Included:

Settings -> Sytem -> Navigation -> (Style) Pie controls

- Navigation key size, (moved from pie controls settings)
- Add checkbox to enable Custom Carrier Label for Pie Controls
- Add preference screen "Color"

  Color:

  - Add checkbox "Theme default", (load default colors from current theme)
  - Add checkbox "Colored icons", (load icons from current theme without color overlay)
  - Add customizeable snap clor
  - Add customizeable overlay color
  - Add customizeable text color
  - Add customizeable button background color
  - Add customizeable button background selected color
  - Add customizeable button background long pressed color
  - Add customizeable button outline color
  - Add customizeable button icon color

Color pickers:

 - Enable transparenzy slider

Menu buttons:

- Add reset to CM default
- Add reset to Dark Jelly default
- Add backup current color values
- Add restore color values