[2/2] Settings: Emulate KEYCODE_MENU from navbar

This allows the overflow menu to be put at the bottom of the screen like on a
device which does not have a navbar
fix a derp with recent SuperSU commit
fix a derp with navring recent-app/kill-app
Customization Settings: reshuffle

Move Buttons settings to the top, move Themes and Halo to the bottom.