Add navigation bar and -ring customizations, (2/2):

Thanks to SlimRoms

Included:

- Navbar up to 5 buttons
- navring up to 5 buttons
- custom arrangement for navbar and navring buttons
- longpress actions for navbar and navring buttons
- custom navbar icon and glow color
- customize navbar and navring icons, (default, system icons, and "user" icons)
- navbar height and width
- option to show navbar at buttom or right side on landscape, (on all devices)
- option to show/hide navbar (on all devices)
- disable navring, (delete all buttons)
- navbar menu button options:
  - show always, never or if needed
  - show on left, right or both sides