Navigation bar buttons customization

Navigation bar buttons customization: Padding fix
Fix padding calculation

Navigation bar buttons customization: Fix left over glow
Invalidate all buttons, to avoid nearby glow interference
SystemUI: highlight quick settings and notification clear buttons

Actually make use of the drawables bestowed upon us by the Google
SystemUI: Clean up old H+ drawables causing issues on manta

These drawables seem to be adapted to fit the old combined
tablet status bar. They mistakenly gets used on manta with
an oversized H+ drawable as a result.
Navigation bar custom height