Settings: add back notification shortcuts + mahdi classes we need

this will add back mahdi notification shorcuts feature as well
we add common slim classes we use for navbar navring pie etc
see fb commit for more details
Settings: Navbar & Navring Customization from Slim (2/2)

This patch adds:
- Navbar up to 5 buttons
- navring up to 5 buttons
- dynamic menu behaviour
- landscape navbar options as well now on tablets
- button glow color
- button icon color
- navrign and navbar user can set system or custom icons
- navbar height and width
- enable/disable navbar and navring
- actions are vor navbar and available for the whole system over SlimActions.java
        back
        custom app or activtiy
        home
        kill app
        last app
        notification drawer
        ime switcher
        power menu
        qs pannel
        recents screen
        screen off
        screenshot
        search
        torch if it is available on the device