Settings: Add battery status ring around unlock ring, (2/2):

Included:

- Add Settings header "Lockscreen"
- Add Color picker preference,
  (by Sergey Margaritov, Daniel Nilsson, and Slimroms)
- Add battery status ring around unlock ring:
  (Based on OmniRom)

  Included:

  - Enable/disable battery status ring
  - Option to load default color values from theme/system
  - Display battery status ring dotted/solid
  - Customize ring dots, (lenght, interval, offset)
  - Custom battery status ring color
  - Custom battery status ring charging color

Colors:
While charging, display the charging color.
Without charging and battery status is below 14%, the color turns into red,
otherwise, display the ring color.